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Capability Analysis

Forward…from the Seabed?

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Seabed Warfare Week

By David R. Strachan

Events of the past decade have forced the United States Navy to re-imagine undersea warfare in light of two emerging and interrelated trends: the rise of sophisticated unmanned undersea systems, and a dramatic increase in geopolitical tensions suggesting the return to an era of near-peer competition and great power conflict. Russian activities in the Crimea, Middle East, and the Arctic, as well as China’s growing regional influence in the South China Sea and Indian Ocean are prompting the Navy to shift its priorities from confronting lesser threats such as rogue states and nonstate actors, and being a “global force for good,” to planning and preparing for the possibility of large-scale warfare against a well-equipped, modern navy. As such, warfighting concepts and operations mothballed after the Cold War are now in need of urgent re-tooling for the current era.1

One such operation experiencing a kind of renaissance is mine warfare which, when combined with unmanned technologies and key infrastructure based on the ocean floor, transforms into the more potent strategic tool of seabed warfare. But even the concept of seabed warfare is itself in transition, and is on track to be fully subsumed by the broader paradigm of autonomous undersea warfare. Mines and associated sensors, as currently employed, will be a thing of the past as their functionality is absorbed by fleets of smart, mobile, autonomous vehicles. More profound still will be the range of new threats unleashed by autonomous undersea warfare. The U.S. Navy must anticipate these threats and recognize that its continued dominance of the undersea domain will rest on its ability to prepare for the kind of combat the coming era of unmanned undersea conflict will entail.

Not Your Father’s Seabed

Warfare conducted on and from the ocean floor is nothing new. For the better part of a century, ships, aircraft, and submarines laid mines and encapsulated torpedos fitted with an array of magnetic, acoustic, and pressure sensors. SOSUS provided valuable intelligence on Soviet naval activities, and during the 1970s, U.S. spy submarines successfully tapped Soviet undersea cables, resulting in what is arguably one of the greatest intelligence coups of the Cold War. But while conceptually seabed warfare may not be new, it is evolving, and is poised to be more fully developed and integrated into the wider grid of unmanned maritime operations.

The U.S. Navy and DARPA have anticipated this evolution, and have proposed a variety of operating concepts to prepare for it, namely:

  • Advanced Undersea Warfare System (AUWS) – A distributed network of remotely controlled unmanned systems that can be rapidly deployed and custom configured for battlespace shaping and A2/AD. 2
  • Forward Deployed Energy and Communications Outpost (FDECO) – An array of fixed undersea docking stations providing recharging, communications, and data transfer to extend UUV reach and endurance.
  • Modular Undersea Effectors System (MUSE) – A system of fixed, encapsulated payloads capable of deploying weapons, decoys, communications nodes, and other such “effectors.”3
  • Hydra – A DARPA-led initiative that calls for a distributed undersea network of unmanned payloads and platforms “trucked in” and deployed from large UUVs.
  • Upward Falling Payloads (UFP) – Similar to MUSE, this DARPA initiative proposes fixed, self-contained payloads on the seabed for remote activation and deployment.

The future state of seabed warfare lies somewhere in the integration of these five operational concepts. Appropriately, each one showcases the dominant role of unmanned, autonomous or semi-autonomous systems that are tightly networked to both manned and unmanned assets operating above, on, and below the sea. But they also rely heavily on the deployment of fixed seabed infrastructure, specialized hardware that may be required in the near-term, but will present logistical challenges and also leave critical systems vulnerable to attack. We should expect that in the opening days, if not hours, of a war with Russia or China, seabed systems will be at the top of the target list. Therefore, while this configuration may work for coastal defense of the United States and our allies, its cumbersome and resource intensive nature will only add a layer of operational complexity that could compromise readiness in a forward deployed environment.

Nipping at Our Heels

Our adversaries are not standing still, and are inching ever closer to technological parity with the United States in both unmanned undersea systems and seabed warfare. Both Russia and China maintain robust search and development programs that have resulted in impressive gains over the past few years alone.

Since 2007, Russia has made great strides in undersea warfare, deploying several new classes of submarines, and conducting deep sea operations on the floor of the Arctic Ocean, and has made no secret of its intention to build a robust undersea capability to offset the asymmetric advantage of the United States. Among some of Russia’s more impressive initiatives include:

  • Project 09852 Belgorod – At 600 feet, this modified Oscar II-class is the largest nuclear submarine ever built. It is designed to operate on or near the Arctic seabed, and deploy an array of unmanned vehicles, manned submersibles, and other systems, “including ones that do not yet exist.”4
  • Oceanic Multipurpose System Status-6 – An intercontinental nuclear powered autonomous torpedo, purportedly capable of speeds of up to 100 knots and a running depth of 1000 meters, this doomsday weapon is armed with a 100 megaton “salted cobalt” warhead capable of destroying ports and naval installations and rendering the area uninhabitable for decades.
  • Harmony – A SOSUS-style network of bottom sensors placed on the floor Arctic Ocean and powered by small nuclear reactors.5
  • Project 09851 Khabarovsk – A submarine designed ostensibly as a deployment platform for Status-6.6

Russian submarines have also been observed near undersea cables in the North Atlantic, prompting speculation that Moscow is either exploiting or interfering with global information flows, or preparing for the possibility of severing critical information infrastructure in the event of war.

Diagram of Russian Project 09852 Belgorod. (via Hisutton.com)

China, on the other hand, seems content, at least publicly, to assume a more defensive posture and focus on establishing a wide network of fixed and mobile sensors in the South China Sea. Chinese vessels have been aggressively mapping the seabed and gathering oceanographic data for scientific and military applications. Last summer, a dozen Haiyi undersea gliders were released into the South China Sea, reaching record depths while transmitting data in real-time to land-based laboratories, suggesting a breakthrough in undersea communications.7 And China State Shipbuilding Corporation has put forth a concept it calls the “Great Undersea Wall,” a distributed network of air, surface, and subsurface sensors to identify and track submarines in the South China Sea.8 A three dimensional model of the project featured an array of sensors, UUV docking stations, and undersea cables, very similar to FDECO.9  While publicly China’s seabed warfare efforts appear to be mirroring those of the United States, given the breathtaking extent of China’s activities in the Spratly Islands, we can only speculate as to what may be occurring on the ocean floor, and whether it moves beyond benign surveillance to something more lethal.

What do these developments by our potential adversaries mean for the United States Navy? Clearly both Russia and China are achieving significant technological milestones that should concern if not alarm Navy leaders. As such, we are reaching a point where it may not be enough to deploy passive, defensive systems that do little more than blunt offensive capabilities. The Navy is, at the end of the day, a fighting force, and it should be prepared to fight, and the fight may be soon happening on or near the seabed.

Preparing for a New Kind Of Conflict

Numerous seabed and UUV programs are currently under development or deployed to the Fleet. Given that we are still very much in the infancy of unmanned undersea warfare, this should be expected and encouraged. The Navy should indeed cast a wide net in an effort to understand the potential and the limits of unmanned systems. However, while “letting all the flowers grow” has its merits, the time for greater clarity in roles and expectations for these systems is here, particularly as advancements in adversary programs continue unabated.10

While any AUV program should integrate a full spectrum of effectors, it is critical that it also be capable of intercepting enemy unmanned vehicles and striking enemy seabed infrastructure. To date, however, the development of unmanned undersea craft has been driven by non-combat requirements – oceanographic research, intelligence gathering, mine countermeasures and other roles deemed too dangerous or tedious for human involvement. Other than passing references to anti-UUV operations, little has been written regarding the potential for equipping unmanned undersea vehicles for combat or strike operations. This may be due to the infancy of the technology, or ethical considerations surrounding autonomy, or that it smacks too much of science fiction, but it may also be due to the fact that actual undersea combat (i.e. submersible vs. submersible, submersible vs. seabed target) has been largely nonexistent, and in fact has only resulted in one kill in the history of submarine warfare.11 Since World War II, undersea warfare has been more a high-stakes game of cat and mouse, to deliver cruise missile attacks, gather intelligence, and maintain a viable nuclear deterrent.

But whereas in peacetime there is every reason to avoid confrontations between manned platforms, such reasoning may not necessarily hold in the case of unmanned systems. Unencumbered by this imperative, and with the cover of the opaque undersea environment, as well as plausible deniability to cloak them, fleets of unmanned vehicles will be free to disrupt, degrade, and destroy seabed infrastructure – and one another – at will.

As such, the Navy should move to develop a single, highly modular class of autonomous undersea vehicle that operates in “Strikepods,” adaptive, autonomous undersea strike groups comprised of any number of vehicles, and designed to execute missions of varying scale and complexity, such as ASW, ISR, MCM, and EMW, but also, importantly, counter-AUV and time-critical strike. Deployed from shore, surface ships, aerial assets, or submarines, and operating either within the water column or on the seabed, they would effectively eliminate the need for cumbersome, costly, and vulnerable fixed infrastructure on the sea floor.

Given its highly modular design, each vehicle would be capable of performing the role of any effector, from sensor to communications node to weapon, whether mobile, hovering, or fixed on the seabed, and ideally would be capable of dynamically reconfiguring at a moment’s notice to compensate for losses or malfunctions and ensure mission success. Strikepods could clandestinely penetrate the A2/AD defenses of an adversary and then deploy to the seabed as fixed bottom sensors, or EMW nodes, or could await further orders and dynamically activate as a bottom mines, or CAPTOR-style mines to attack enemy submarines or surface ships. In a combat role, Strikepods could be programmed to swarm and attack enemy submarines or surface ships, seek and destroy enemy unmanned vehicles, or attack enemy seabed infrastructure.

Autonomous undersea combat vehicles represent a logical progression in the emerging era of undersea warfare, a fact that will not be lost on our adversaries. They too will one day be capable of deploying AUVs in a covert, standoff manner, and operating within our territorial waters and inland waterways with impunity. Moreover, their low cost and eventual proliferation could enable rogue states and nonstate actors to acquire their own “poor man’s navy” and threaten U.S. forces at home or abroad. Thus, the need for a coastal undersea defense network will be vital to counter this threat. For example, an “Atlantic Undersea Defense Network” (AUDEN) would be a regional tactical grid comprised of numerous Strikepods deployed along the coast near ports, chokepoints, naval installations, and critical infrastructure. AUDEN Strikepods would operate both within the water column and on the seabed to deter incursions of adversary AUVs, and, if necessary, detect and engage them.

Conclusion

As the world undergoes a shift toward near-peer competition, the U.S. Navy must reexamine its role as a fighting force in light of unmanned undersea systems, and the aspirations of ever more technologically sophisticated adversaries. Seabed warfare in particular, understood as a combination of “old school” mine warfare with advanced technologies, is evolving rapidly, and is poised to be more fully developed and integrated into the new paradigm of autonomous undersea warfare. The Navy’s continued undersea dominance will rest on its ability to master seabed warfare, and to anticipate and prepare for the kind of challenges, threats, and opportunities autonomous undersea conflict will present. It will no longer be enough for the Navy to simply out-fight its adversaries. In the era of autonomous conflict, it will have to out-innovate them.

David R. Strachan is a naval analyst and writer living in Silver Spring, MD. His website, Strikepod Systems (strikepod.com), explores the emergence of unmanned undersea warfare via real-time speculative fiction. He can be reached at [email protected].

Endnotes

[1] Dmitry Filipoff, “The Navy’s New Fleet Problem Experiments and Stunning Revelations of Military Failure,” Center for International Maritime Security (CIMSEC), March 5, 2018. https://cimsec.org/the-navys-new-fleet-problem-experiments-and-stunning-revelations-of-military-failure/35626

[2] See: Dave Everhart, “MINWARA Technical Session I, Advanced Undersea Weapons System (AUWS) [PowerPoint presentation], May 8, 2012. https://cle.nps.edu/access/content/group/3edf6e90-24e8-4c31-bffd-0ee5fb3581a6/public/presentations/Tues%20pm%20A/1330%20Everhart%20AUWS.pdf, Scott D. Burleson, David E. Everhart, Ronald E. Swart, and Scott C. Truver, “The Advanced Undersea Weapon System: On the Cusp of a Naval Warfare Transformation,” Naval Engineers Journal, March 2012. http://www.ingentaconnect.com/contentone/asne/nej/2012/00000124/00000001/art00010;jsessionid=76tt4k2q2j7d9.x-ic-live-02, Joshua J. Edwards and Captain Dennis M. Gallagher, USN, “Mine and Undersea Warfare for the Future,” Proceedings Magazine, August, 2014. https://www.usni.org/magazines/proceedings/2014-08/mine-and-undersea-warfare-future

[3] Scott Truver, “Naval Mines and Mining: Innovating in the Face of Benign Neglect,” Center for International Maritime Security (CIMSEC), December 20, 2016. https://cimsec.org/naval-mines-mining-innovating-face-benign-neglect/30165

[4] David Hambling, “Why Russia is sending robotic submarines to the Arctic,” BBC, November 21, 2017. http://www.bbc.com/future/story/20171121-why-russia-is-sending-robotic-submarines-to-the-arctic

[5] HI Sutton, “’Harmony’ submarine detection network, Covert Shores, November 12, 2017. http://www.hisutton.com/Spy%20Subs%20-Project%2009852%20Belgorod.html

[6] Ibid.

[7] Stephen Chen, “Why Beijing is Speeding Up Underwater Drone Tests in the South China Sea”, South China Morning Post, July 26, 2017. http://www.scmp.com/news/china/policies-politics/article/2103941/why-beijing-speeding-underwater-drone-tests-south-china

[8] Catherine Wong, “’Underwater Great Wall:’ Chinese firm proposes building network of submarine detectors to boost nations defence,” South China Morning Post, May 19, 2016. http://www.scmp.com/news/china/diplomacy-defence/article/1947212/underwater-great-wall-chinese-firm-proposes-building

[9] Jeffrey Lin and P.W. Singer, “The Great Underwater Wall of Robots: Chinese Exhibit Shows Off Sea Drones,” Popular Science, June 22, 2016. https://www.popsci.com/great-underwater-wall-robots-chinese-exhibit-shows-off-sea-drones

[10] Testimony of Bryan Clark, House Committee on Armed Services, Subcommittee on Seapower and Projection Forces, Game Changers – Undersea Warfare, 114th Cong., 1st Sess., p. 7, October 27, 2015. https://armedservices.house.gov/legislation/hearings/game-changers-undersea-warfare

[11] Sebastien Roblin, “The True Story of the Only Underwater Submarine Battle Ever,” The National Interest, November 18, 2017. http://nationalinterest.org/blog/the-buzz/the-true-story-the-only-underwater-submarine-battle-ever-23253

Featured Image: Russian Harpsichord-2P-PM (via Hisutton.com)

Drones

Unmanned Mission Command, Pt. 2

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By Tim McGeehan

The following two-part series discusses the command and control of future autonomous systems. Part 1 describes how we have arrived at the current tendency towards detailed control. Part 2 proposes how to refocus on mission command.

Adjusting Course

Today’s commanders are accustomed to operating in permissive environments and have grown addicted to the connectivity that makes detailed control possible. This is emerging as a major vulnerability. For example, while the surface Navy’s concept of “distributed lethality” will increase the complexity of the detection and targeting problems presented to adversaries, it will also increase the complexity of its own command and control. Even in a relatively uncontested environment, tightly coordinating widely dispersed forces will not be a trivial undertaking. This will tend toward lengthening decision cycles, at a time when the emphasis is on shortening them.1 How will the Navy execute operations in a future Anti-Access/Area-Denial (A2/AD) scenario, where every domain is contested (including the EM spectrum and cyberspace) and every fraction of a second counts? 

The Navy must “rediscover” and fully embrace mission command now, to both address current vulnerabilities as well as unleash the future potential of autonomous systems. These systems offer increased precision, faster reaction times, longer endurance, and greater range, but these advantages may not be realized if the approach to command and control remains unchanged. For starters, to prepare for future environments where data links cannot be taken for granted, commanders must be prepared to give all subordinates, human and machine, wide latitude to operate, which is only afforded by mission command. Many systems will progress from a man “in” the loop (with the person integral to the functioning), to a man “on” the loop (where the person oversees the system and executes command by negation), and then to complete autonomy. In the future, fully autonomous systems may collaborate with one another across a given echelon and solve problems based on the parameters communicated to them as commander’s intent (swarms would fall into this category). However, it may go even further. Mission command calls for adaptable leaders at every level; what if at some level the leaders are no longer people but machines? It is not hard to imagine a forward deployed autonomous system tasking its own subordinates (fellow machines), particularly in scenarios where there is no available bandwidth to allow backhaul communications or enable detailed control from afar. In these cases, mission command will not just be the preferred option, it will be the only option. This reliance on mission command may be seen as a cultural shift, but in reality, it is a return to the Navy’s cultural roots.

Back to Basics

Culturally, the Navy should be well-suited to embrace the mission command model to employ autonomous systems. Traditionally once a ship passed over the horizon there was little if any communication for extended periods of time due to technological limitations. This led to a culture of mission command: captains were given basic orders and an overall intent; the rest was up to them. Indeed, captains might act as ambassadors and conduct diplomacy and other business on behalf of the government in remote areas with little direct guidance.2 John Paul Jones himself stated that “it often happens that sudden emergencies in foreign waters make him [the Naval Officer] the diplomatic as well as the military representative of his country, and in such cases he may have to act without opportunity of consulting his civic or ministerial superiors at home, and such action may easily involve the portentous issue of peace or war between great powers.”3  This is not to advocate that autonomous systems will participate in diplomatic functions, but it does illustrate the longstanding Navy precedent for autonomy of subordinate units.

Another factor in support of the Navy favoring mission command is that the physics of the operating environment may demand it. For example, the physical properties of the undersea domain prohibit direct, routine, high-bandwidth communication with submerged platforms. This is the case with submarines and is being applied to UUVs by extension. This has led to extensive development of autonomous underwater vehicles (AUVs) vice remotely operated ones; AUVs clearly favor mission command.

Finally, the Navy’s culture of decentralized command is the backbone of the Composite Warfare Commander (CWC) construct. CWC is essentially an expression of mission command. Just as technology (the telegraph cable, wireless, and global satellite communication) has afforded the means of detailed control and micromanagement, it has also increased the speed of warfighting, necessitating decentralized execution. Command by negation is the foundation of CWC, and has been ingrained in the Navy’s officer corps for decades. Extending this mindset to autonomous systems will be key to realizing their full capabilities.

Training Commanders

This begs the question: how does one train senior commanders who rose through the ranks during the age of continuous connectivity to thrive in a world of autonomous systems where detailed control is not an option? For a start, they could adopt the mindset of General Norman Schwarzkopf, who described how hard it was to resist interfering with his subordinates:

“I desperately wanted to do something, anything, other than wait, yet the best thing I could do was stay out of the way. If I pestered my generals I’d distract them:  I knew as well as anyone that commanders on the battlefield have more important things to worry about than keeping higher headquarters informed…”4

That said, even while restraining himself, at the height of OPERATION DESERT STORM, his U.S. Central Command used more than 700,000 telephone calls and 152,000 radio messages per day to coordinate the actions of their subordinate forces. In contrast, during the Battle of Trafalgar in 1805, Nelson used only three general tactical flag-hoist signals to maneuver the entire British fleet.5

Commanders must learn to be satisfied with the ambiguity inherent in mission command. They must become comfortable clearly communicating their intent and mission requirements, whether tasking people or autonomous systems. Again, there isn’t a choice; the Navy’s adversaries are investing in A2/AD capabilities that explicitly target the means that make detailed control possible. Furthermore, the ambiguity and complexity of today’s operating environments prohibit “a priori” composition of complete and perfect instructions.

Placing commanders into increasingly complex and ambiguous situations during training will push them toward mission command, where they will have to trust subordinates closer to the edge who will be able to execute based on commander’s intent and their own initiative. General Dempsey, former Chairman of the Joint Chiefs of Staff, stressed training that presented commanders with fleeting opportunities and rewarding those who seized them in order to encourage commanders to act in the face of uncertainty.

Familiarization training with autonomous systems could take place in large part via simulation, where commanders interact with the actual algorithms and rehearse at a fraction of the cost of executing a real-world exercise. In this setting, commanders could practice giving mission type orders and translating them for machine understanding. They could employ their systems to failure, analyze where they went wrong, and learn to adjust their level of supervision via multiple iterations. This training wouldn’t be just a one-way evolution; the algorithms would also learn about their commander’s preferences and thought process by finding patterns in their actions and thresholds for their decisions. Through this process, the autonomous system would understand even more about commander’s intent should it need to act alone in the future. If the autonomous system will be in a position to task its own robotic subordinates, that algorithm would be demonstrated so the commander understands how the system may act (which will have incorporated what it has learned about how its commander commands).

With this in mind, while it may seem trivial, consideration must be made for the fact that future autonomous systems may have a detailed algorithmic model of their commander’s thought process, “understand” his intent, and “know” at least a piece of “the big picture.” As such, in the future these systems cannot simply be considered disposable assets performing the dumb, dirty, dangerous work that exempt a human from having to go in harm’s way. They will require significant anti-tamper capabilities to prevent an adversary from extracting or downloading this valuable information if they are somehow taken or recovered by the enemy. Perhaps they could even be armed with algorithms to “resist” exploitation or give misleading information. 

The Way Ahead

Above all, commanders will need to establish the same trust and confidence in autonomous systems that they have in manned systems and human operators.6 Commanders trust manned systems, even though they are far from infallible. This came to international attention with the airstrike on the Medecins Sans Frontieres hospital operating in Kunduz, Afghanistan. As this event illustrated, commanders must acknowledge the potential for human error, put mitigation measures in place where they can, and then accept a certain amount of risk. In the future, advances in machine learning and artificial intelligence will yield algorithms that far exceed human processing capabilities. Autonomous systems will be able to sense, process, coordinate, and act faster than their human counterparts. However, trust in these systems will only come from time and experience, and the way to secure that is to mainstream autonomous systems into exercises. Initially these opportunities should be carefully planned and executed, not just added in as an afterthought. For example, including autonomous systems in a particular Fleet Battle Experiment solely to check a box that they were used raises the potential for negative training, where the observers see the technology fail due to ill-conceived employment. As there may be limited opportunities to “win over” the officer corps, this must be avoided. Successfully demonstrating the capabilities (and the legitimate limitations) of autonomous systems is critical. Increased use over time will ensure maximum exposure to future commanders, and will be key to widespread adoption and full utilization.  

The Navy must return to its roots and rediscover mission command in order to fully leverage the potential of autonomous systems. While it may make commanders uncomfortable, it has deep roots in historic practice and is a logical extension of existing doctrine. Former General Dempsey wrote that mission command “must pervade the force and drive leader development, organizational design and inform material acquisitions.”7 Taking this to heart and applying it across the board will have profound and lasting impacts as the Navy sails into the era of autonomous systems.

Tim McGeehan is a U.S. Navy Officer currently serving in Washington. 

The ideas presented are those of the author alone and do not reflect the views of the Department of the Navy or Department of Defense.

References

[1] Dmitry Filipoff, Distributed Lethality and Concepts of Future War, CIMSEC, January 4, 2016, https://cimsec.org/distributed-lethality-and-concepts-of-future-war/20831

[2] Naval Doctrine Publication 6: Naval Command and Control, 1995, http://www.dtic.mil/dtic/tr/fulltext/u2/a304321.pdf, p. 9      

[3] Connell, Royal W. and William P. Mack, Naval Customs, Ceremonies, and Traditions, 1980, p. 355.

[4] Schwartzkopf, Norman, It Doesn’t Take a Hero:  The Autobiography of General Norman Schwartzkopf, 1992, p.523

[5] Ibid 2, p. 4

[6] Greg Smith, Trusting Autonomous Systems: It’s More Than Technology, CIMSEC, September 18, 2015, https://cimsec.org/trusting-autonomous-systems-its-more-than-technology/18908     

[7] Martin Dempsey, Mission Command White Paper, April 3, 2012, http://www.dtic.mil/doctrine/concepts/white_papers/cjcs_wp_missioncommand.pdf

Featured Image: SOUTH CHINA SEA (April 30, 2017) Sailors assigned to Helicopter Sea Combat Squadron 23 run tests on the the MQ-8B Firescout, an unmanned aerial vehicle, aboard littoral combat ship USS Coronado (LCS 4). (U.S. Navy photo by Mass Communication Specialist 3rd Class Deven Leigh Ellis/Released)

Capability Analysis, Drones

Game-Changing Unmanned Systems for Naval Expeditionary Forces

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By George Galdorisi

Perspective

In 2018 the United States remains engaged worldwide. The 2017 National Security Strategy addresses the wide-range of threats to the security and prosperity of United States.1 These threats range from high-end peer competitors such as China and Russia, to rogue regimes such as North Korea and Iran, to the ongoing threat of terrorism represented by such groups as ISIL. In a preview of the National Security Strategy at the December 2017 Reagan National Defense Forum, National Security Advisor General H.R. McMaster highlighted these threats and reconfirmed the previous administration’s “4+1” strategy, naming the four countries – Russia, China, Iran and North Korea—and the “+1” — terrorists, particularly ISIL — as urgent threats that the United States must deal with today.2

The U.S. military is dealing with this threat landscape by deploying forces worldwide at an unprecedented rate. And in most cases, it is naval strike forces, represented by carrier strike groups centered on nuclear-powered aircraft carriers, and expeditionary strike groups built around large-deck amphibious ships, that are the forces of choice for dealing with crises worldwide.

For decades, when a crisis emerged anywhere on the globe, the first question a U.S. president asked was, “Where are the carriers?” Today, that question is still asked, but increasingly, the question has morphed into, “Where are the expeditionary strike groups?” The reasons for this focus on expeditionary strike groups are clear. These naval expeditionary formations have been the ones used extensively for a wide-array of missions short of war, from anti-piracy patrols, to personnel evacuation, to humanitarian assistance and disaster relief. And where tensions lead to hostilities, these forces are the only ones that give the U.S. military a forcible entry option.

During the past decade-and-a-half of wars in the Middle East and South Asia, the U.S. Marine Corps was used extensively as a land force and did not frequently deploy aboard U.S. Navy amphibious ships. Now the Marine Corps is largely disengaged from those conflicts and is, in the words of a former commandant of the U.S. Marine Corps, “Returning to its amphibious roots.”3 As this occurs, the Navy-Marine Corps team is looking to new technology to complement and enhance the capabilities its amphibious ships bring to the fight. 

Naval Expeditionary Forces: Embracing Unmanned Vehicles

Because of their “Swiss Army Knife” utility, U.S. naval expeditionary forces have remained relatively robust even as the size of the U.S. Navy has shrunk from 594 ships in 1987 to 272 ships in early 2018. Naval expeditionary strike groups comprise a substantial percentage of the U.S. Navy’s current fleet. And the blueprint for the future fleet the U.S. Navy is building maintains, and even increases, that percentage of amphibious ships.4

However, ships are increasingly expensive and U.S. Navy-Marine Corps expeditionary forces have been proactive in looking to new technology to add capability to their ships. One of the technologies that offer the most promise in this regard is that of unmanned systems. The reasons for embracing unmanned systems stem from their ability to reduce the risk to human life in high-threat areas, to deliver persistent surveillance over areas of interest, and to provide options to warfighters that derive from the inherent advantages of unmanned technologies—especially their ability to operate autonomously.

The importance of unmanned systems to the U.S. Navy’s future has been highlighted in a series of documents, ranging from the 2015 A Cooperative Strategy for 21st Century Seapower, to the 2016 A Design for Maintaining Maritime Superiority, to the 2017 Chief of Naval Operations’ The Future Navy white paper. The Future Navy paper presents a compelling case for the rapid integration of unmanned systems into the Navy Fleet, noting, in part:

“There is no question that unmanned systems must also be an integral part of the future fleet. The advantages such systems offer are even greater when they incorporate autonomy and machine learning….Shifting more heavily to unmanned surface, undersea, and aircraft will help us to further drive down unit costs.”5

The U.S. Navy’s commitment to and growing dependence on unmanned systems is also seen in the Navy’s official Force Structure Assessment of December 2016, as well as in a series of “Future Fleet Architecture Studies.” In each of these studies—one by the Chief of Naval Operations staff, one by the MITRE Corporation, and one by the Center for Strategic and Budgetary Assessments—the proposed Navy future fleet architecture had large numbers of air, surface, and subsurface unmanned systems as part of the Navy force structure. Indeed, these reports highlight the fact that the attributes unmanned systems can bring to the U.S. Navy Fleet circa 2030 have the potential to be truly transformational.6

The Navy Project Team, Report to Congress: Alternative Future Fleet Platform Architecture Study is an example of the Navy’s vision for the increasing use of unmanned systems. This study notes that under a distributed fleet architecture, ships would deploy with many more unmanned surface (USV) and air (UAV) vehicles, and submarines would employ more unmanned underwater vehicles (UUVs). The distributed Fleet would also include large, self-deployable independent USVs and UUVs, increasing unmanned deployed presence to approximately 50 platforms.

This distributed Fleet study calls out specific numbers of unmanned systems that would complement the manned platforms projected to be part of the U.S. Navy inventory by 2030:

  • 255 Conventional take-off UAVs
  • 157 Vertical take-off UAVs
  • 88 Unmanned surface vehicles
  • 183 Medium unmanned underwater vehicles
  • 48 Large unmanned underwater vehicles

By any measure the number of air, surface, and subsurface unmanned vehicles envisioned in the Navy alternative architecture studies represents not only a step-increase in the number of unmanned systems in the Fleet today, but also vastly more unmanned systems than current Navy plans call for. But it is one thing to state the aspiration for more unmanned systems in the Fleet, and quite another to develop and deploy them. There are compelling reasons why naval expeditionary forces have been proactive in experimenting with emerging unmanned systems.

Testing and Evaluating Unmanned Systems

While the U.S. Navy and Marine Corps have embraced unmanned systems of all types into their force structures, and a wide-range of studies looking at the makeup of the Sea Services in the future have endorsed this shift, it is the Navy-Marine Corps expeditionary forces that have been the most active in evaluating a wide variety of unmanned systems in various exercises, experiments, and demonstrations. Part of the reason for this accelerated evaluation of emerging unmanned systems is the fact that, unlike carrier strike groups that have access to unmanned platforms such as MQ-4C Triton and MQ-8 Fire Scout, expeditionary strike groups are not similarly equipped.

While several such exercises, experiments, and demonstrations occurred in 2017, two of the most prominent, based on the scope of the events, as well as the number of new technologies introduced, were the Ship-to-Shore Maneuver Exploration and Experimentation (S2ME2) Advanced Naval Technology Exercise (ANTX), and Bold Alligator 2017. These events highlighted the potential of unmanned naval systems to be force-multipliers for expeditionary strike groups.

S2ME2 ANTX provided an opportunity to demonstrate emerging, innovative technology that could be used to address gaps in capabilities for naval expeditionary strike groups. As there are few missions that are more hazardous to the Navy-Marine Corps team than putting troops ashore in the face of a prepared enemy force, the experiment focused specifically on exploring the operational impact of advanced unmanned maritime systems on the amphibious ship-to-shore mission. 

For the amphibious assault mission, UAVs are useful—but are extremely vulnerable to enemy air defenses.  UUVs are useful as well, but the underwater medium makes control of these assets at distance problematic. For these reasons, S2ME2 ANTX focused heavily on unmanned surface vehicles to conduct real-time ISR (intelligence, surveillance, and reconnaissance) and IPB (intelligence preparation of the battlespace) missions. These are critical missions that have traditionally been done by our warfighters, but ones that put them at extreme risk.

Close up of USV operating during S2ME2; note the low-profile and stealthy characteristics (Photo courtesy of Mr. Jack Rowley).

In an October 2017 interview with U.S. Naval Institute News, the deputy assistant secretary of the Navy for research, development, test and evaluation, William Bray, stressed the importance of using unmanned systems in the ISR and IPB roles:

“Responding to a threat today means using unmanned systems to collect data and then delivering that information to surface ships, submarines, and aircraft. The challenge is delivering this data quickly and in formats allowing for quick action.”7

During the assault phase of S2ME2 ANTX, the expeditionary commander used a USV to thwart enemy defenses. For this event, he used an eight-foot man-portable MANTAS USV (one of a family of stealthy, low profile, USVs) that swam undetected into the “enemy harbor” (the Del Mar Boat Basin on the Southern California coast), and relayed information to the amphibious force command center using its TASKER C2 system. Once this ISR mission was complete, the MANTAS USV was driven to the surf zone to provide IPB on obstacle location, beach gradient, water conditions and other information crucial to planners. 

Unmanned surface vehicle (MANTAS) operating in the surf zone during the S2ME2 exercise (Photo courtesy of Mr. Jack Rowley).

Carly Jackson, SPAWAR Systems Center Pacific’s director of prototyping for Information Warfare and one of the organizers of S2ME2, explained the key element of the exercise was to demonstrate new technology developed in rapid response to real-world problems facing the Fleet:

“This is a relatively new construct where we use the Navy’s organic labs and warfare centers to bring together emerging technologies and innovation to solve a very specific fleet force fighting problem. It’s focused on ‘first wave’ and mainly focused on unmanned systems with a big emphasis on intelligence gathering, surveillance, and reconnaissance.”8

The CHIPS interview article discussed the technologies on display and in demonstration at the S2ME2 ANTX event, especially networked autonomous air and maritime vehicles and ISR technologies. Tracy Conroy, SPAWAR Systems Center Pacific’s experimentation director, noted, “The innovative technology of unmanned vehicles offers a way to gather information that ultimately may help save lives. We take less of a risk of losing a Marine or Navy SEAL.”

S2ME2 ANTX was a precursor to Bold Alligator 2017, the annual Navy-Marine Corps expeditionary exercise. Bold Alligator 2017 was a live, scenario-driven exercise designed to demonstrate maritime and amphibious force capabilities, and was focused on planning and conducting amphibious operations, as well as evaluating new technologies that support the expeditionary force.9

Bold Alligator 2017 encompassed a substantial geographic area in the Virginia and North Carolina OPAREAS. The mission command center was located at Naval Station Norfolk, Virginia. The amphibious force and other units operated eastward of North and South Onslow Beaches, Camp Lejeune, North Carolina. For the littoral mission, some expeditionary units operated in the Intracoastal Waterway near Camp Lejeune.

The Bold Alligator 2017 scope was modified in the wake of Hurricanes Harvey, Irma and Maria, as many of the assets scheduled to participate were used for humanitarian assistance and disaster relief. The exercise featured a smaller number of amphibious forces but did include a carrier strike group.10 The 2nd Marine Expeditionary Brigade (MEB) orchestrated events and was embarked aboard USS Arlington (LPD-24), USS Fort McHenry (LSD-43), and USS Gunston Hall (LSD-44).

The 2nd MEB used a large (12-foot) MANTAS USV, equipped with a Gyro Stabilized SeaFLIR230 EO/IR Camera and a BlueView M900 Forward Looking Imaging Sonar to provide ISR and IPB for the amphibious assault. The sonar was employed to provide bottom imaging of the surf zone, looking for objects and obstacles—especially mine-like objects—that could pose a hazard to the landing craft–LCACs and LCUs–as they moved through the surf zone and onto the beach.

The early phases of Bold Alligator 2017 were dedicated to long-range reconnaissance. Operators at exercise command center at Naval Station Norfolk drove the six-foot and 12-foot MANTAS USVs off North and South Onslow Beaches, as well as up and into the Intracoastal Waterway. Both MANTAS USVs streamed live, high-resolution video and sonar images to the command center. The video images showed vehicles, personnel, and other objects on the beaches and in the Intracoastal Waterway, and the sonar images provided surf-zone bottom analysis and located objects and obstacles that could provide a hazard during the assault phase.

Bold Alligator 2017 underscored the importance of surface unmanned systems to provide real-time ISR and IPB early in the operation. This allowed planners to orchestrate the amphibious assault to ensure that the LCACs or LCUs passing through the surf zone and onto the beach did not encounter mines or other objects that could disable—or even destroy—these assault craft. Providing decision makers not on-scene with the confidence to order the assault was a critical capability and one that will likely be evaluated again in future amphibious exercises such as RIMPAC 2018, Valiant Shield 2018, Talisman Saber 2018, Bold Alligator 2018 and Cobra Gold, among others.

Navy Commitment to Unmanned Maritime Systems

One of the major challenges to the Navy making a substantial commitment to unmanned maritime systems is the fact that they are relatively new and their development has been “under the radar” for all but a few professionals in the science and technology (S&T), research and development (R&D), requirements, and acquisition communities. This lack of familiarity creates a high bar for unmanned naval systems in particular. A DoD Unmanned Systems Integrated Roadmap provided a window into the magnitude of this challenge:

“Creation of substantive autonomous systems/platforms within each domain will create resourcing and leadership challenges for all the services, while challenging their respective warfighter culture as well…Trust of unmanned systems is still in its infancy in ground and maritime systems….Unmanned systems are still a relatively new concept….As a result; there is a fear of new and unproven technology.”11

In spite of these concerns—or maybe because of them—the Naval Sea Systems Command and Navy laboratories have been accelerating the development of USVs and UUVs. The Navy has partnered with industry to develop, field, and test a family of USVs and UUVs such as the Medium Displacement Unmanned Surface Vehicle (“Sea Hunter”), MANTAS next-generation unmanned surface vessels, the Large Displacement Unmanned Underwater Vehicle (LDUUV), and others.

Indeed, this initial prototype testing has been so successful that the Department of the Navy has begun to provide increased support for USVs and UUVs and has established program guidance for many of these systems important to the Navy and Marine Corps. This programmatic commitment is reflected in the 2017 Navy Program Guide as well as in the 2017 Marine Corps Concepts and Programs publications. Both show a commitment to unmanned systems programs.12

In September 2017, Captain Jon Rucker, the program manager of the Navy program office (PMS-406) with stewardship over unmanned maritime systems (unmanned surface vehicles and unmanned underwater vehicles), discussed his programs with USNI News. The title of the article, “Navy Racing to Test, Field, Unmanned Maritime Vehicles for Future Ships,” captured the essence of where unmanned maritime systems will fit in tomorrow’s Navy, as well as the Navy-after-next. Captain Rucker shared:

“In addition to these programs of record, the Navy and Marine Corps have been testing as many unmanned vehicle prototypes as they can, hoping to see the art of the possible for unmanned systems taking on new mission sets. Many of these systems being tested are small surface and underwater vehicles that can be tested by the dozens at tech demonstrations or by operating units.”13

While the Navy is committed to several programs of record for large unmanned maritime systems such as the Knifefish UUV, the Common Unmanned Surface Vehicle (CUSV), the Large Displacement UUV (LDUUV) and Extra Large UUV (XLUUV), and the Anti-Submarine Warfare Continuous Trail Unmanned Vessel (ACTUV) vehicle (since renamed the Medium Displacement USV [MDUSV] and also called Sea Hunter), the Navy also sees great potential in expanding the scope of unmanned maritime systems testing:

“Rucker said a lot of the small unmanned vehicles are used to extend the reach of a mission through aiding in communications or reconnaissance. None have become programs of record yet, but PMS 406 is monitoring their development and their participation in events like the Ship-to-Shore Maneuver Exploration and Experimentation Advanced Naval Technology Exercise, which featured several small UUVs and USVs.”14

The ship-to-shore movement of an expeditionary assault force remains the most hazardous mission for any navy. Real-time ISR and IPB will spell the difference between victory and defeat. For this reason, the types of unmanned systems the Navy and Marine Corps should acquire are those systems that directly support our expeditionary forces. This suggests a need for unmanned surface systems to complement expeditionary naval formations. Indeed, USVs might well be the bridge to the Navy-after-next.

Captain George Galdorisi (USN – retired) is a career naval aviator whose thirty years of active duty service included four command tours and five years as a carrier strike group chief of staff. He began his writing career in 1978 with an article in U.S. Naval Institute Proceedings. He is the Director of Strategic Assessments and Technical Futures at the Navy’s Command and Control Center of Excellence in San Diego, California. 

The views presented are those of the author, and do not reflect the views of the Department of the Navy or Department of Defense.

Correction: Two pictures and a paragraph were removed by request. 

References

[1] National Security Strategy of the United States of America (Washington, D.C.: The White House, December 2017) accessed at: https://www.whitehouse.gov/wp-content/uploads/2017/12/NSS-Final-12-18-2017-0905-2.pdf.

[2] There are many summaries of this important national security event. For one of the most comprehensive, see Jerry Hendrix, “Little Peace, and Our Strength is Ebbing: A Report from the Reagan National Defense Forum,” National Review, December 4, 2017, accessed at: http://www.nationalreview.com/article/454308/us-national-security-reagan-national-defense-forum-offered-little-hope.

[3] Otto Kreisher, “U.S. Marine Corps Is Getting Back to Its Amphibious Roots,” Defense Media Network, November 8, 2012, accessed at: https://www.defensemedianetwork.com/stories/return-to-the-sea/.

[4] For a most comprehensive summary of U.S. Navy shipbuilding plans, see Ron O’Rourke Navy Force Structure and Shipbuilding Plans: Background and Issues for Congress (Washington, D.C.: Congressional Research Service, November 22, 2017).

[5] The Future Navy (Washington, D.C.: Department of the Navy, May 2017) accessed at: http://www.navy.mil/navydata/people/cno/Richardson/Resource/TheFutureNavy.pdf. See also, 2018 U.S. Marine Corps S&T Strategic Plan (Quantico, VA: U.S. Marine Corps Warfighting Lab, 2018) for the U.S. Marine Corps emphasis on unmanned systems, especially man-unmanned teaming.

[6] See, for example, Navy Project Team, Report to Congress: Alternative Future Fleet Platform Architecture Study, October 27, 2016, MITRE, Navy Future Fleet Platform Architecture Study, July 1, 2016, and CSBA, Restoring American Seapower: A New Fleet Architecture for the United States Navy, January 23, 2017.

[7] Ben Werner, “Sea Combat in High-End Environments Necessitates Open Architecture Technologies,” USNI News, October 19, 2017, accessed at: https://news.usni.org/2017/10/19/open-architecture-systems-design-is-key-to-navy-evolution?utm_source=USNI+News&utm_campaign=b535e84233-USNI_NEWS_DAILY&utm_medium=email&utm_term=0_0dd4a1450b-b535e84233-230420609&mc_cid=b535e84233&mc_eid=157ead4942

[8] Patric Petrie, “Navy Lab Demonstrates High-Tech Solutions in Response to Real-World Challenges at ANTX17,” CHIPS Magazine Online, May 5, 2017, accessed at http://www.doncio.navy.mil/CHIPS/ArticleDetails.aspx?id=8989.

[9] Information on Bold Alligator 2017 is available on the U.S. Navy website at: http://www.navy.mil/submit/display.asp?story_id=102852.

[10] Phone interview with Lieutenant Commander Wisbeck, Commander, Fleet Forces Command, Public Affairs Office, November 28, 2017.

[11] FY 2009-2034 Unmanned Systems Integrated Roadmap, pp. 39-41.

[12] See, 2017 Navy Program Guide, accessed at: http://www.navy.mil/strategic/npg17.pdf, and 2017 Marine Corps Concepts and Programs accessed at:  https://marinecorpsconceptsandprograms.com/.

[13] Megan Eckstein, “Navy Racing to Test, Field, Unmanned Maritime Vehicles for Future Ships,” USNI News, September 21, 2017, accessed at: https://news.usni.org/2017/09/21/navy-racing-test-field-unmanned-maritime-vehicles-future-ships?utm_source=USNI+News&utm_campaign=fb4495a428-USNI_NEWS_DAILY&utm_medium=email&utm_term=0_0dd4a1450b-fb4495a428-230420609&mc_cid=fb4495a428&mc_eid=157ead4942

[14] “Navy Racing to Test, Field, Unmanned Maritime Vehicles for Future Ships.”

Featured Image: Marines with 3rd Battalion, 5th Marine Regiment prepare a Weaponized Multi-Utility Tactical Transport vehicle for a patrol at Marine Corps Base Camp Pendleton, Calif., July 13, 2016. (USMC photo by Lance Cpl. Julien Rodarte)

Future Tech

Swarming Sea Mines: Capital Capability?

2 Comments

Future Capital Ship Topic Week

By Zachary Kallenborn

“A ‘capital ship,’ rightly understood, is a ship type that can defeat any other ship type. In the days of sail and dreadnoughts, it was the type of ship having the most and biggest guns. It is the ship type around which fleet doctrine and fleet architecture are established. The question is what kind of killing weapon the capital ship supports.”
—Robert Rubel1

Introduction

The Navy’s Strategic Studies Group 35 concluded the “Navy’s next capital ship will not be a ship. It will be the Network of Humans and Machines, the Navy’s new center of gravity, embodying a superior source of combat power.”2

Such a network could consist of networks of sea mine swarms and their support ships. Networked sea mine swarms could converge on masses of adversary ships, bringing to bear overwhelming force. The visibility of surface support ships would enable the network to generate conventional deterrence by signaling the swarm’s presence, while helping maintain the swarm itself.3 The history of mine warfare suggests swarming sea mines could deliver a decisive force.

Sea mines can already inflict significant damage on all other types of ship, including capital ships.4 On April 14, 1988, a single contact mine nearly sank the USS Samuel B. Roberts (FFG 58), causing over $96 million in damage.5 Since World War II, mines have seriously damaged or sunk 15 U.S. ships, nearly four times more than all other threats combined.6 However, unlike aircraft carriers and other capital ships, traditional sea mines offer little ability to project power and, once identified, can be avoided.

But what if sea mines could move themselves intelligently and coordinate their actions? They could rove the seas in advance of friendly fleet movements and position themselves into an adversary’s path. Multiple mines could strike a single target. Naval mines could become a critical aspect of seapower. Networks of naval mine swarms could become the future capital ship. 

Swarming sea mines can do exactly that.

Swarming Sea Mines: The Concept

Swarming sea mines consist of interconnected, undersea drones dispersed over an area. Drones within the swarm communicate with one another to coordinate their actions. Sensor drones7 within the swarm disperse, broadly searching for incoming targets. Sensor drones relay information to attack drones to engage an adversary vessel, or stand down to allow a friendly vessel to pass.

Attack drones may be either undersea turrets or free-roaming munitions. As undersea turrets, attack drones serve as platforms for launching torpedoes or other munitions. Input from sensor drones informs the trajectory for launch. As a free-roaming munition, an attack drone functions like a traditional sea mine. Using on-board propulsion systems, the attack drone maneuvers to the adversary vessel and detonates in proximity.

Interconnectivity enables swarming attacks. Multiple attack drones may launch attacks from different directions. This increases the likelihood of successfully sinking an adversary ship because (1) strikes hit different parts of the adversary hull and (2) it enables multiple strikes on the same target, putting at risk larger ships that may survive a single detonation. Interconnectivity could also enable networks of sea mine swarms to coordinate strikes, significantly increasing the number of attack drones. Such a capability would be useful in attacking an adversary fleet, with multiple swarms coordinating target selection. 

EMB Mine being laid from an S-Boote. (Photo from Suddentscher Verlag)

As the size of the swarm grows, so too does its combat power. Larger swarms mean more sensors in the network and more munitions to overwhelm targets. The Department of Defense (DoD) recently fielded a swarm of 103 aerial drones.8 China also reportedly fielded a swarm of 1,000 aerial drones.7 In theory, a sea mine swarm could consist of tens of thousands of interconnected mines, able to overwhelm any target. The primary limitation on swarm growth is the capacity to manage the rapidly increasing complexity of drone information exchange.

Strategically, swarming sea mines could play the same roles as traditional sea mines. Sea mines may be used to control critical chokepoints. During the Iran-Iraq war, Iran seeded the entrance to the Strait of Hormuz with Soviet contact mines.9 Alternatively, they could be used to inhibit amphibious forces attempting to come ashore. During the 1990-1991 Persian Gulf War, Iraq deployed sea mines to limit coalition forces’ ability to launch an amphibious assault.10 Similarly, during the Korean War, North Korean mining of Wonsan Harbor “prevented over 50,000 U.S. Marines from coming ashore and allowed the North Koreans to withdraw their forces.”11 However, swarming sea mines can play additional roles, such as protecting friendly vessels.

Advantages over Traditional Mines

Swarming sea mines have qualitatively better capabilities. Compared to traditional mines, swarming sea mines have drastically increased the threat through autonomous movement, broad area coverage, and information integration.

Autonomous Movement

Advances in robotics enable unmanned systems to maneuver and act without human decision-making.13 DoD’s Perdix drone swarm shares a “distributed brain” to make decisions and react to the environment.14 The swarm fully controls its own behavior without human direction, other than setting broad mission goals. Other autonomous systems such as the South Korean SGR-A1 gun turret can reportedly identify and engage targets.15 Although DoD policy does not allow autonomous weapons systems to select humans as targets, traditional sea mines already autonomously engage targets.16

Maneuverability enhances the psychological effects of minefields. Fear over encountering a minefield can affect behavior without inflicting damage. Once a vessel passes through a traditional minefield, it is often safe. However, a swarming minefield may move to a new area, adding new uncertainties.

Greater maneuverability enables drone-based naval mines to incorporate automated retreat rules. For example, after a specified time, drones may disarm and leave the area. Friendly vessels may then retrieve and redeploy them in another location. For traditional naval mines, retrieval is a highly fraught task because a retrieving vessel may inadvertently detonate the mine. Emplaced mines cannot be reused; swarming sea mines can.

Autonomous decision-making would enable swarming sea mines to identify and respond to changes in environmental conditions that could mitigate their effects. With traditional bottom mines on the seafloor, strong tides and currents can shift the mines.17 Swarming mines could recognize this shift and adjust.

Types of Naval mine.A-underwater,B-bottom,SS-Submarine. 1-Drifting mine,2-Drifting mine,3-Moored Mine,4-Moored Mine(short wire),5-Bottom Mines,6-Torpedo mine/CAPTOR mine,7-Rising mine (Wikimedia Commons)

Autonomous movement is a significant departure from the capabilities of traditional naval mines. While some advanced mobile mines such as the MK 67 Submarine-Laid Mobile Mine can be placed from afar, the MK 67 remains in place.18 Other naval mines are able to move with the current. None of these mines can position themselves intelligently.

Information Integration

The inter-connectivity of a drone swarm enables naval mines to integrate information from many different sensors. Sensor drones could incorporate traditional influence sensors, including magnetic, acoustic, and seismic sensors.19 Data from multiple sensors may be shared to minimize false positives. Sensor drones may roam freely, studying an area for potential targets, creating greater situational awareness. Alternatively, buried sensor drones could enable live battle-damage assessment. If an adversary vessel survives an initial strike, additional attackers may be called to follow and engage.

Swarming naval mines may be connected into broader intelligence and surveillance networks. Information from these networks could enable the swarm minefield to reposition based on adversary behavior. For example, naval intelligence may identify an adversary vessel about to enter a given area and relay that information to the drone swarm to maneuver into the vessel’s path.

While traditional naval mines are already capable of incorporating multiple sensors to prevent false positives, they are unable to share information with one another.20

Broad Area Coverage

Maneuverability and information integration would enable swarming sea mines to greatly increase the threatened area. Sensor drones can disperse broadly to provide maximum situational awareness. Information may then be relayed to other drones to engage an incoming target.

Like attack drones, sensor drones may be free roaming or stationary, though there are trade-offs. Free-roaming sensor drones may actively search an area looking for targets. This enables much broader coverage; however, communication ranges may limit the distance they can travel. Stationary sensing drones may float near the surface or bury themselves in the seafloor. Sensor drones that bury themselves minimize the profile presented to adversaries, lowering detectability. However, stationary drones lose the benefits of mobility, providing less area coverage.

The increased area coverage is efficient because fewer munitions would be required to control a given area. Mines will take up less space on friendly vessels while having the same impact. This is especially important for submarine-launched mines, because submarines have very limited storage capacity. Currently, to equip submarines with mines requires removing torpedoes at the rate of one torpedo for every two mines.21

Challenges

Despite these significant advantages, however, operationalizing the concept entails some significant challenges. None of these challenges appears insurmountable, and work is already being done to address them, but they must be considered for concept viability and to realize the benefits of swarming.

Undersea Communication

The ability of the swarm to function as a unit depends on drone communication. Underwater, this is a major challenge. Traditional communication methods are often based on electromagnetic transmissions that are ineffective underwater.22 Underwater communications must rely on acoustic communication, which is slower, has small bandwidth, and has high error rates.23 The lack of electromagnetic communication also prevents drones from using GPS guidance for coordination and localization.

Initial research points to the inclusion of relays and surface-based control drones as a solution (see footnote 5 for a brief typology of drone archetypes). To address the lack of underwater GPS penetration, Jules Jaffe and his research team incorporated GPS-localized surface buoys that emit acoustic signals.24 Their underwater drones passively receive the buoy’s signals and, based on the known location of the surface floats, determine their own location.25 Similarly, Thomas Schmickl and his research team use a “surface base station” emitting an acoustic signal for localization and establishing boundaries to ensure no drone gets lost in the ocean’s expanse.26 The station also receives status updates from the swarm, such as task completion.

From a military perspective, a surface control drone may be undesirable because it could be identified and targeted, neutralizing the minefield. To prevent this, control drones could be underwater with a GPS periscope extending above the surface to receive and transmit signals. Alternatively, swarms could incorporate redundant control drones. If one is eliminated, the minefield stays live.

More broadly, the underwater environment creates difficulties in countering adversary attempts to disrupt communications. An adversary is likely to target inter-swarm communication because if communications are disrupted, so too is the swarm.27 Unfortunately, the properties of underwater communication mean terrestrial jamming detection technologies do not operate effectively.28

Tethering and Reseeding

Reseeding a minefield is often a significant challenge. If most mines have detonated, the minefield offers little utility. Adding mines in hostile terrain while incur risk such as on January 18, 1991 when Iraqi forces shot down a mine-dropping A-6 aircraft.29 The mobility of drone swarms diminishes some of this challenge because the drones may be deployed from afar to move into position.

Reseeded mines must also tether to the swarm’s network. An added attack drone needs to integrate with the other attackers and with the broader sensor network. Reseeded drones need to recognize that they are a part of the minefield’s network and vice versa. It also requires the distributed brain of the swarm to incorporate the new drones into task assignment and overall control.30

Coordinated re-positioning removes some difficulty. If few attack drones have been destroyed, the other drones can fill any gaps. However, as the losses grow larger, or if the swarm had few attackers to begin with, adding attackers becomes a greater challenge.

Power

The availability of power limits swarm operations. On-board power is required to maintain communications, use propulsion systems, and operate and interpret the results of sensing systems. These requirements limit the amount of time the swarm can pose a threat.

One possible solution is sea-based charging facilities. Support ships could be created whose primary role is to recharge undersea drones, including swarming sea mines. They could also be used for swarm maintenance, reseeding the swarm, or long-range transportation. Alternatively, the Navy’s work on unmanned undersea pods could allow for undersea recharging.31 This would likely be most useful for mining friendly territory because the pods would need to be pre-positioned and adversaries could target them. As swarm size increases, so too will this challenge. Large swarms may also encounter queuing problems if only a few drones can charge simultaneously. Regardless of the solution, time spent traveling to and from recharging facilities also limits time in a mission area.

Conclusion

A 2001 National Research Council study painted a bleak picture of U.S. naval mine warfare: “The current U.S. naval mining capability is in woefully bad shape with small inventories, old and discontinued mines, insufficient funding for maintenance of existing mines, few funded plans for future mine development (and none for acquisition), declining delivery assets, and a limited minefield planning capability in deployed battle groups.”32 This holds true today: the Navy’s FY17 to FY21 budget anticipates spending only $29.4 million on acquiring offensive mines.33 Similarly, the FY17 to FY21 budget for the Navy’s only research and development program for mine systems is $56.9 million.34 All new mine development is relegated to converting Submarine-Laid Mobile Mine warheads for underwater drone delivery.

If networked swarms of sea mines represent the Navy’s future capital ship, that picture must be repainted. Drastically.

Zachary Kallenborn is a Senior Associate Analyst at ANSER pursuing broad research into the military implications of drone swarms.

The author would also like to thank Jerry Driscoll, Steve Dunham, and Keith Sauls for providing useful comments and edits on a draft of the article. Needless to say, any issues or mistakes are the author’s own.

The views herein are presented in a personal capacity and do not necessarily reflect the institutional position of ANSER or its clients.

References

1. Robert C. Rubel, “The Future of Aircraft Carriers,” US Naval War College Review 64, Autumn 2011, https://www.usnwc.edu/getattachment/87bcd2ff-c7b6-4715-b2ed-05df6e416b3b/The-Future-of-Aircraft-Carriers.

2. Bill Glenney, “Institute for Future Warfare Studies Wants Your Writing on the Capital Ship of the Future,” Center for International Maritime Security (CIMSEC), https://cimsec.org/institute-for-future-warfare-studies-wants-your-writing-on-the-capital-ship-of-the-future/33307

3. John Fleming notes the importance of visibility in conventional deterrence in John Fleming, “Capital Ships: a Historical Perspective,” Naval War College, July 12, 1993, 17, http://www.dtic.mil/dtic/tr/fulltext/u2/a266915.pdf

4. John J. Rios, “Naval Mines in the 21st Century: Can NATO Navies Meet the Challenge?” thesis, Naval Postgraduate School, June 2005, 1, www.dtic.mil/dtic/tr/fulltext/u2/a435603.pdf; “Mine Warfare,” Department of the Navy, Office of the Chief of Naval Operations and Headquarters U.S. Marine Corps, NWP 3-15 and MCWP 3-3.1.2, https://archive.org/stream/milmanual-mcwp-3-3.1.2-mine-warfare/mcwp_3-3.1.2_mine_warfare_djvu.txt.

5. Scott C. Truver, “Taking Mines Seriously: Mine Warfare in China’s Near Seas,” Naval War College Review 65, Spring 2012, https://www.usnwc.edu/getattachment/19669a3b-6795-406c-8924-106d7a5adb93/Taking-Mines-Seriously–Mine-Warfare-in-China-s-Ne; Bradley Peniston, “The Day Frigate Samuel B. Roberts Was Mined,” USNI [U.S. Naval Institute] News, May 22, 2015, https://news.usni.org/2015/05/22/the-day-frigate-samuel-b-roberts-was-mined.

6. Scott C. Truver, 2012.

7. In general, there are four drone archetypes: Attacker, Sensor, Controller, and Decoy (the ASCDs). Attack drones carry munitions or are themselves munitions. Sensor drones provide information about the surrounding environment. Control drones manage the swarm’s behavior to ensure the swarm can operate together, providing direct leadership or ensuring the operation of communication channels. Decoy drones serve no role other than to increase the apparent size of the swarm, creating psychological effects, or drawing fire for functional drones. This framework is the author’s own; however, it is consistent with others such as Jeffrey Kline’s Shooter, Scout, and Commander. Jeffrey E. Kline, “Impacts of the Robotics Age on Naval Force Design, Effectiveness, and Acquisition,” Naval War College Review 70, Summer 2017, https://www.usnwc.edu/getattachment/db52797a-a972-44cd-951b-f2b847b193b3/Impacts-of-the-Robotics-Age-on-Naval-Force-Design,.aspx.

8. “Department of Defense Announces Successful Micro-Drone Demonstration,” DoD news release, January 9, 2017, https://www.defense.gov/News/News-Releases/News-Release-View/Article/1044811/department-of-defense-announces-successful-micro-drone-demonstration/.

9. Gary Mortimer, “Chinese One Thousand Drone Swarm Smashes Intel Record,” sUAS News: The Business of Drones, February 13, 2017, https://www.suasnews.com/2017/02/chinese-one-thousand-drone-swarm-smashes-intel-record/.

10. Captain Gregory J. Cornish, U.S. Navy, “U.S. Naval Mine Warfare Strategy: Analysis of the Way Ahead,” U.S. Army War College, April 2003.

11. Gregory J. Cornish, 2003.

12. John J. Rios, citing Gregory K. Hartmann and Scott C. Truver. Weapons That Wait: Mine Warfare in the U.S. Navy. Updated Edition. (Annapolis, MD: Naval Institute Press, 1991), 231.

13. Determining appropriate rules of engagement is also a critical, related challenge; however, that is not within the scope of this article.

14. “Perdix Fact Sheet,” DoD Strategic Capabilities Office, June 1, 2017, https://www.defense.gov/Portals/1/Documents/pubs/Perdix%20Fact%20Sheet.pdf.

15. Alexander Velez-Green, “The Foreign Policy Essay: The South Korean Sentry—A ‘Killer Robot’ to Prevent War,” Lawfare, March 1, 2015, https://www.lawfareblog.com/foreign-policy-essay-south-korean-sentry%E2%80%94-killer-robot-prevent-war.

16. DoD Directive 3000.09: “Autonomy in Weapon Systems,” November 21, 2012, https://cryptome.org/dodi/dodd-3000-09.pdf.

17. Scott C. Truver, 2012.

18. National Research Council, Committee for Mine Warfare Assessment, “Naval Mine Warfare: Operational and Technical Challenges for Naval Warfare,” Washington D.C.: National Academy Press, 2001, 58.

19. For additional details on mine actuation mechanisms, see “Mine Warfare,” section 2.2.3.2, “Influence Actuation Logic.”

20. “Mine Warfare.”

21. “Mine Warfare.”

22. John Heidemann, Milica Stojanovic, and Michele Zorzi, “Underwater Sensor Networks: Applications, Advances, and Challenges,” Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, January 2012, http://rsta.royalsocietypublishing.org/content/370/1958/158.

23. Luiz Filipe M. Vieira, “Underwater Sensor Networks,” in Jonathan Loo, Jaime Lloret Mauri, and Jesus Hamilton Ortiz, Eds., Mobile Ad Hoc Networks: Current Status and Future Trends (Boca Raton, FL: CRC Press, 2012).

24. Jules S. Jaffe, et al., “A Swarm of Autonomous Miniature Underwater Robot Drifters for Exploring Submesoscale Ocean Dynamics,” Nature Communications 8, 2017, https://www.nature.com/articles/ncomms14189; for a more accessible version of their research, see Jesse Emspak, “Scientists Used Underwater Drone Swarms to Solve the Mystery of Plankton Mating,” Quartz, January 24, 2017, https://qz.com/893590/scientists-used-underwater-drone-swarms-to-solve-the-mystery-of-plankton-mating/.

25. Jules Jaffe, et al., 2017.

26. Thomas Schmickl, et al., “CoCoRo—The Self-Aware Underwater Swarm,” 2011 Fifth IEEE [Institute of Electrical and Electronics Engineers] International Conference on Self-Adaptive and Self-Organizing Systems, 2011, http://zool33.uni-graz.at/artlife/sites/default/files/cocoro_SASO_paper_revision_as_finally_submitted.pdf.

27. Paul Scharre, “Counter-Swarm: A Guide to Defeating Robotic Swarms,” War on the Rocks, March 31, 2015, https://warontherocks.com/2015/03/counter-swarm-a-guide-to-defeating-robotic-swarms/.

28. S. Misra, et al, “Jamming in Underwater Sensor Networks: Detection and Mitigation,” IEE [Institution of Engineering and Technology] Communications 6, November 6, 2012, http://ieeexplore.ieee.org/document/6353315/.

29. National Research Council, Committee for Mine Warfare Assessment, 2001, 18.

30. Some initial work has been done on scalable drone swarm control algorithms. See Payam Zahadat and Thomas Schmickl, “Division of Labor in a Swarm of Autonomous Underwater Robots by Improved Partitioning Social Inhibition,” Adaptive Behavior 24, 2016, http://journals.sagepub.com/doi/full/10.1177/1059712316633028.

31. Michael Hoffman, “Undersea Pods to Hold US War Supplies,” Defense Tech, January 16, 2013, https://www.defensetech.org/2013/01/16/undersea-pods-to-hold-us-war-supplies/.

32. National Research Council, Committee for Mine Warfare Assessment, 2001, 57.

33. “Department of Defense Fiscal Year (FY) 2017 President’s Budget Submission: Navy, Justification Book Volume 1 of 1, Weapons Procurement, Navy,” Secretary of the Navy, February 2016, 307, http://www.secnav.navy.mil/fmc/fmb/Documents/17pres/WPN_Book.pdf

34. “Department of Defense Fiscal Year (FY) 2017 President’s Budget Submission: Navy, Justification Book Volume 3 of 5, Research, Development, Test, and Evaluation, Navy, Budget Activity 5,” Secretary of the Navy, February 2016, 947, http://www.secnav.navy.mil/fmc/fmb/Documents/17pres/RDTEN_BA5_Book.pdf.

Featured Image: EMC Contact Mines aboard a Leberecht Maas class destroyer in Autumn 1940 (via Navweaps.com)