Tag Archives: featured

May Recap

CIMSEC

Announcements and Updates
India’s Role in the Asia-Pacific Topic Week Wraps up on CIMSEC by Dmitry Filipoff
Call for Articles: The Future of Undersea Competition Topic Week by Sally DeBoer
CIMSEC April Recap by Dmitry Filipoff
CIMSEC DC’s May Chapter Meetup by Scott Cheney-Peters
CIMSEC 2016 Election Nominations Now Open by CIMSEC Team
The Future of Undersea Competition Topic Week Kicks Off on CIMSEC by Dmitry Filipoff

Future of Undersea Competition Topic Week
India’s Submarine Situation: Evolving Capabilities and Opportunities by Vidya Sagar Reddy and Rajeswari Pillai Rajagopalan
Information Management in Next Generation Anti-Submarine Warfare by Michael Glynn

Podcasts
Sea Control 117- Niger Delta Pirates Declare War? with Matt Hipple and Dirk Steffen
Sea Control 118- ISIS Capabilities Against Civil Aviation with Matthew Merighi and Max Leitschuh

Interviews
CIMSEC Interviews Captain Mark Vandroff Program Manager DDG 51 by Dmitry Filipoff
Part One
Part Two
Comic Books & War: An Interview with Dr. Cord A. Scott by Christopher Nelson
A Converation with G. William Weatherly, Author of Sheppard of the Argonne by Sally DeBoer

Members Roundup
Members’ Roundup: April 2016 by Sam Cohen
Members’ Roundup: May 2016 Part One by Sam Cohen

Events
9-14 May 2016 Maritime Security Events by Emil Maine

Naval Affairs
The End of Uniformed Naval Strategic Study? by Steve Wills
Wargaming Distributed Lethality by LT Megan Mcculloch
MK VI: The Next Generation of Interdiction by Lawrence Hajek
Navy Perspective on Joint Force Interdependence by ADM. Jon Greenert
crossposted from National Defense University JFQ
Assessing the Usefulness of the American Large Deck Carrier by Ben Ho Wan Beng
Deception and the Backfire Bomber: Part One by Jon Solomon
crossposted from Information Dissemination

Asia-Pacific
Asymmetric Maritime Diplomacy: Involving Coastguards, Maritime Militias in China Dealings by Alex Calvo
Turbulence for the Philippines: Blimps Over the South China Sea by Vidya Sagar Reddy
From Frontier to Frontline: Tanmen Maritime Militia’s Leading Role Pt. 2 by Conor M. Kennedy and Andrew S. Erickson
The Concept of “Reach” in Grasping China’s Active Defense Strategy Part One by VADM. Pradeep Chauhan (ret)
crossposted from Bharat Shakti
Cam Rahn International Port Visits in Strategic Context by Zachary Abuza and Nguyen Nhat Anh
America’s Expectation versus India’s Expediency: India as a Regional Net Security Provider by Gurpreet S. Khurana
crossposted from the National Maritime Foundation
The Criticality of the IONS Maritime Security Construct by VADM. Pradeep Chauhan (ret)

Europe
Unsafe Mixed Migration By Sea: The Case of the Mediterranean Region by Evmorfia-Chrysovalantou Seiti

Cyber
A Cyber-Information Operations Offset Strategy to Counter the Surge of Chinese Power by Jake Bebber
Part One (Apr.)
Part Two

Reviews
Sheppard of the Argonne: Alternative History Naval Battles of WWII by Sally Deboer
Thomas Jefferson and the Tripoli Pirates by CDR Greg Smith
The Paracel Islands and U.S. Interests and Approaches in the South China Sea by Ching Chang
Diplomatic Dimension of Maritime Challenges for India in the 21st Century by G. Parthasarathy

Featured Image:  ATLANTIC OCEAN (April 21, 2016) The future guided-missile destroyer USS Zumwalt (DDG 1000) transits the Atlantic Ocean during acceptance trials April 21, 2016 with the Navy’s Board of Inspection and Survey (INSURV). (U.S. Navy/Released)

Latin America’s Training Vessels

By W. Alejandro Sanchez

In late January, the Peruvian Navy commissioned its newest training vessel, the BAP Union, which will train future generations of naval cadets. This brand new ship is an ideal starting point to discuss the vessels utilized by Latin American navies to instruct their cadets. As any sailor knows, there is no replacement for hands-on experience aboard a vessel to train future naval officers and personnel. 

Latin American navies understand this fact, hence, training vessels regularly carry out voyages in which they visit several international ports. These multinational trips fulfill two purposes: to train cadets and serve as floating ambassadors in order to develop friendly relations between navies and nations.

A Comprehensive List

We will begin our discussion by briefly listing the numerous training vessels that Latin American navies possess. Apart from the Union, the region’s newest training ship, other vessels include  Argentina’s ARA Libertad, Brazil’s NVe Cisne Branco and the NE Brasil, Chile’s B.E. Esmeralda, Colombia’s ARC Gloria, Ecuador’s BAE Guayas, Mexico’s ARM Cuauhtemoc, Uruguay’s ROU Capitan Miranda and Venezuela’s ARBV Simon Bolivar. Since an in-depth discussion of every Latin American training vessel would require a comprehensive report, we will focus on providing some general remarks.

First, a quick overview of these vessels finds a strong influence from Spanish shipyards. The Peruvian state-controlled shipyard SIMA (Servicios Industriales de la Marina) constructed the Union in its shipyard in the port of Callao, but the Spanish company CYPSA Ingenieros Navales cooperated in the vessel’s structural design. As for other ships, many were constructed by Spanish companies. For example Colombia’s Gloria, Ecuador’s Guayas, Mexico’s Cuauhtemoc, and Venezuelan’s Simon Bolivar were all manufactured by Astilleros Celaya S.A., while Chile’s Esmeralda was obtained from the Spanish government which constructed it at the Echevarrieta y Larrinaga shipyard in Cadiz. One exception to the rule is Brazil’s Cisne Branco, which was constructed by the Dutch company Damen Shipyard.

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The Peruvian Training Vessel “Union” was commissioned in a ceremony headed by President Ollanta Humala. This is the largest masted vessel in Latin America. Photo: Ministerio de Defensa del Perú (Peru Ministry of Defense).

Second, these vessels are all masted ships unsurprisingly. Without getting into detailed specifications, it is worth noting that the Mexican Cuauhtemoc has three masts (for a grand total of 23 sails) while Argentina’s Libertad has three masts and 27 sails. Finally, Peru’s Union, has four masts, making it the biggest regional training vessel. There is one vessel that is without masts, the Brazilian Brasil, which is a modified Niteroi-class frigate.

Finally, cadets also board warships  as part of their training.  For example, Colombian cadets from the “Almirante Padilla” naval school have taken a trip aboard the frigate ARC Antioquia to further their instruction.

Training At Sea: A Confidence Building Mechanism

Training vessels have a diplomatic and confidence building component to their voyages. Most of their trips include stops in various international forts, turning these vessels into ambassadors at sea of their respective nations.

For the sake of brevity, we will mention a couple of recent itineraries. Mexico’s Cuauhtemoc is carrying out an ambitious 205-day voyage in which it will dock in 17 foreign ports in 13 countries (the cruise is known as “Ibero Atlantic 2016”). The vessel docked in New London, Connecticut, from 2-6 May and during the visit, Mexican cadets “interact[ed] with their counterparts at the United States Coast Guard Academy in New London as well as visit[ed] Naval Submarine Base New London in Groton.” Meanwhile, in mid-May the Colombian Gloria returned to the Barranquilla port after a 41 day cruise through the Caribbean, where it visited Castries, capital of Saint Lucia, and Roseau, capital of Dominica.

Ruta
Training Tall Ship America 2014 Itinerary. Image: Secretaria de Marina Mexico (Secretariat of the Navy Mexico)

Training vessels have also carried out ambitious projects, namely sailing around the world. For example, in August 1987, the Uruguayan Capitan Miranda, set sail in a trip around the world, a feat that was accomplished in 355 days. More recently, Ecuador’s Guayas arrived home in early March after a similar voyage that required 295 days to complete.

Another element of confidence building is how foreign naval officers are often invited to take part in some of these cruises. For example, a 2015 multinational trip by Colombia’s Gloria had officers from Brazil, Peru, and Uruguay aboard. Similarly, Venezuela’s Simon Bolivar left port in mid-May for its “Europa 2016” expedition. Accompanying the over 100 Venezuelan cadets aboard are naval personnel from Bolivia, Brazil, Dominican Republic and Uruguay.

Venezuela’s training vessel has a very appropriate nickname: “The Ambassador Without Borders” (“El Embajador Sin Frontera”), which can also be applied to the training vessels of other nations. These are floating embassies that bring together the multinational crew as well as showcasing the best a country has to offer at every port call.

Incidents

It is worth mentioning that when vessels are outside of their nation’s territorial waters, some bizarre and tense situations can occur. A clear example is what happened to Argentina’s Libertad, which has to do with the country’s economy. For the past decade and a half, the South American nation has dealt with  crippling debt due to owing various shadowy corporations known as vulture funds. After many negotiations and court rulings, Argentina paid USD$9 billion to these entities in April.

This financial situation has ramifications with the training vessel because in October 2012, the Libertad made a port call in Ghana. Unfortunately for the crew, the ship was not allowed to depart because the Ghanaian government received a request from a hedge fund called NML Capital Limited to detain the vessel, as a sort of partial repayment for the Argentine government’s debt. The Libertad would then stay in the Ghanaian port of Tema until mid-December, when the Argentine government secured its release (the International Tribunal for the Law of the Sea ruled on the side of Buenos Aires). The ship docked in Buenos Aires in January 2013.

This past April, the Libertad left for a new expedition. Prior to its departure, President Mauricio Macri gave a speech from the vessel’s deck, where he stated that “today we have normalized our relations with the world, today you can depart in peace, because this will not occur again.”

Other vessels have gone through more potentially violent situations, namely when they crossed the Gulf of Aden en route to the Indian Ocean, an area known for pirates that operate out of the Horn of Africa. In 2008 Chile’s Esmeralda crossed the region, and it took measures to prevent an attack, including deploying  30 men on deck armed with rifles and grenade launchers. Ecuador’s Guayas passed the same area this past October 2015, and armed troops were also assigned on deck in case pirates appeared. So far, there have been no reported incidents of training vessels being attacked.

Upgrades Needed?

Unsurprisingly, one problem is the generally advanced age of these ships. For example, the Colombian Gloria was commissioned in 1968, a decade later Ecuador received the Guayas (in 1977) while Venezuela commissioned the Simon Bolivar in 1980. But it is Uruguay that can be proud of having the oldest training vessel still in service in Latin America as the Capitan Miranda was launched in 1930. The vessel was originally constructed as a hydrographic ship at a Spanish shipyard, and was transformed into a training vessel in 1977. The ship carried out its first training voyage the following year.  Prior to Peru’s Union, the region’s newest ship would be Brazil’s Cisne Branco, which was launched and assigned in 2000.

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ARC Gloria Colombia. Photo: Colombian Navy

In other words, most Latin American navies could profit from a new training vessel. One obvious example is the almost-century old Capitan Miranda, which could be turned into a floating museum while the Uruguayan Navy obtains a new ship. The vessel was already upgraded in 1977 and 1993 and it has been in a dock since 2013 as the Navy carries out a new overhaul to increase its lifespan.

Budgetary issues and other security priorities are the obvious main hindrances to regional navies acquiring new training vessels. For example, the Uruguayan Navy is currently undergoing a transformation as it plans to purchase as many as  three OPVs (probably from the German shipyard Lurssen) to patrol its EEZ, which would be the country’s biggest platform acquisition in decades. The deal is rumored to cost USD$250 million, a major investment for a small country. As for other navies, they are also focused on acquiring new platforms. Case in point, Colombia acquired two (used) German submarines, which arrived in 2015, while Mexico’s state-run shipyard ASTIMAR (Astilleros de la Secretaria de Marina) is currently constructing Damen OPVs in its shipyardsFor the time being, it seems that no new training vessels will be constructed.

Final Thoughts

While new naval platforms are necessary to patrol any maritime territory, there is an obvious problem in continuing to use dated equipment to train a Navy’s future officers. Peru and Brazil’s new training vessels are positive developments, but this pattern will probably not be followed by other Latin American states in the near future.

Certainly, it could be argued that as these aging vessels are still operational, it is not imperative to replace them – case in point, the almost-century old Capitan Miranda. However, repairing these ships to extend their lifespan will only get costlier and more time-consuming as time progresses, hence alternative plans should be drafted.

After all, these vessels are important diplomatic tools as they travel different regions of the world, essentially becoming naval ambassadors given their friendly international port calls, which foster positive relations. Moreover, while it is important for any country to possess modern platforms, i.e. OPVs or even a nuclear-powered submarine, ultimately these are machines that need well-trained officers to control and guide. Voyages in training vessels are only one aspect of a naval officer’s education and career, but they are a critical component. It is only logical that naval cadets should have the best training equipment possible in order to become the best officers possible.

W. Alejandro Sanchez is a researcher who focuses on geopolitical, military and cyber security issues in the Western Hemisphere. Follow him on Twitter: @W_Alex_Sanchez.

The views presented in this essay are the sole responsibility of the author and do not necessarily reflect those of any institutions with which the author is associated.

Featured Image: B.E. Esmeralda of the Chilean Navy. Photo: Armada de Chile.

The Future of Undersea Competition Topic Week Concludes on CIMSEC

By Dmitry Filipoff

Last week CIMSEC launched a topic week focused on the future of undersea competition where contributors responded to our Call for Articles to highlight the importance of the undersea domain in a geopolitical and warfighting context and explore evolving challenges. We are thankful for their contributions and insightful analysis.

Below is a list of articles that featured during the topic week.

India’s Submarine Situation: Evolving Capabilities and Opportunities by Vidya Sagar Reddy and Rajeswari Pillai Rajagopalan

“Two events set the stage for India-China strategic competition going underwater – one is the docking of China’s submarine in Sri Lanka’s Colombo port and the other is the loss of India’s submarine INS Sindhurakshak in a major fire incident. These and subsequent events showed that China is signalling its strategic intentions in the Indian Ocean via its submarines while the resident power is scrambling.”

Information Management in Next Generation Anti-Submarine Warfare by Michael Glynn

“Some observers have claimed that advancements in sensor systems and data analysis will strip stealth away from submarines. This erosion of stealth will not happen unless the U.S. Navy solves three distinct challenges: gathering, analyzing, and disseminating environmental information, integrating operations analysis at the operational and tactical levels of war to maximize sensor and weapons effectiveness, and ensuring that ASW task forces are equipped with standardized equipment and highly effective training.”

Dmitry Filipoff is CIMSEC’s Director of Online Content. Reach the CIMSEC editorial team at Nextwar@cimsec.org.

Featured Image:The USS Birmingham (SSN-695) executes an emergency ascent demonstration during her sea trials in TOTO (Tongue of the Ocean), circa late 1977-78. USN photo courtesy of Newport News & Drydock Co.

Silent Victory: U.S. Submarines in the Pacific, 1941-1945

By LCDR Christopher Nelson, USN

Silent VictoryConsim Press has published a fantastic solo player wargame in Silent Victory: U.S. Submarines in the Pacific, 1941-1945.  With game design by Gregory M. Smith, Silent Victory offers a little bit of everything for someone looking for an immersive, historical naval wargame that is easy to play yet detailed enough to be fulfilling for an advanced gamer.


“EXECUTE AGAINST JAPAN UNRESTRICTED AIR AND SUBMARINE WARFARE.”

– Chief of Naval Operations


It’s 1941 and you are a U.S. sub skipper in WWII; tasked to sink Japanese ships — tankers, freighters, personnel carriers, escorts, and capital warships — wherever you find them in the Pacific. You can play as a historical WWII sub skipper or, rather, you can simply play as yourself and choose the class of submarine you’d like to command.  You can even name the boat. When you crack open the box you’ll be impressed with how well Consim has done here.  The patrol maps, captain cards, combat mats, and submarine display mats are all printed on a heavy card-stock and the print quality is excellent.  Also included in the box are the required dice and plenty of copies of the Silent Victory patrol log sheet — important, as it is used to record the total number of tons you sink on your combat missions.

Captain Cards
Silent Victory “Captain Cards” — Play any number of historical U.S. submarine skippers. The cards are well made and display the captain’s awards, patrols, and ships/tonnage sunk.

Game Setup 

The game’s “footprint” is moderate — you’ll need a dinning room table or some floor space to lay out most of the game’s playing mats.  However, if you are space constrained, you can simply stack some of the player mats on top of one another and then retrieve them when it is time to reference a mat during a roll.  Below you’ll see my setup, and even though I had ample table space, I still stacked some of the mats (namely, the target mats which list all Japanese ships), until I needed them.  This is what it looks like:

Silent Victory Setup
Silent Victory setup takes, in my case, up to 2x3ft of a kitchen table. I decided to stack some of the mats underneath others, and I would pull them out when I needed them.

Game setup is tedious for folks playing the game for the first time.  The only reason for this, really, is that you’ll have to punch out all of the game pieces that come with the game. These include everything from Japanese ships to markers that show awards and ranks.  Future game setup is much easier if you take the time to organize the game pieces into plastic bags — grouping munitions in one, for example, and then Japanese ships in others, awards in one, torpedoes in another, and so on.

Now, before you start sinking Japanese ships, the basic setup goes like this:

1.) You decide if you want to play a historical skipper, which includes a specific submarine and starting period (you don’t have to start in 1941), to include patrols (e.g,. The Marianas, The Philippines, The Marshalls, and more). Many of these skippers already come with roll bonuses due to experience. The other option is you simply pick a submarine class and starting point (often dictated by when the submarine class enters service) and then roll dice for patrol areas, next;

2.) You’ll load out your submarine with the good stuff — torpedoes in forward and aft tubes, and ammo for the deck mounted guns on your specific submarine type. The game makers made this easy as each submarine combat mat states on the top of the mat exactly the type of torpedoes available for that submarine. For most, this was a mix of MK14 (steam) and MK18 (electric) torpedoes. Finally;

3.) Fill out your Silent Victory submarine log with the name of the sub, your captain’s name, your rank, and place your boat marker at your home port — now you’re ready to begin.

Gameplay

Once you’ve identified your patrol area, you move your submarine marker through the transit points and into the boxes located in your patrol areas. At each point, to include transit points, you’ll roll dice to see if you encounter enemy units.

North Pacific
Transiting to the Marshall Islands for patrol. Notice on the right hand side that I’ve loaded my torpedo tubes with a mixture of MK18 and MK14 torpedoes.

While transiting, you might come across an aircraft or maybe a lone ship, but this is rare as roll of the dice go. Once you enter your patrol areas, however, the possibilities of rolling an encounter increase. For encounters, you can run into warships, convoys with escorts, or unescorted ships.To the game designer’s credit, they’ve assigned different probabilities per year as to what ships a submarine skipper might encounter. For example, it was tough to find a large Japanese freighter or Japanese capital warship still afloat by 1945. 

Small Freighter
One of the game’s Japanese target mats. You’ll roll two d10s to determine which target you’ve encountered.

Next, when you encounter a Japanese merchant vessel or Japanese warship, you can attack it (you can also choose to not attack). You will roll for day or night. Are you surfaced or submerged? You then assign the type and number of torpedoes and/or deck gun shots against your target(s). Then you will roll to see how effective each shot is. If not already obvious, dice will determine a lot of what occurs in this game — damage to your ship, damage to Japanese ships, being detected, dud torpedoes, and more.  Oh, did I say “dud torpedoes?” Yes. This was a problem in WWII. It is also one of the things that make this a challenging game.

Torps
I encountered two Japanese ships during one patrol. I assigned three torpedoes for each on my combat mat. Excessive? Not really. I quickly learned that for each torpedo launched in 1943 there was a 33% chance that it would not explode or hit its target.

For every torpedo you fire, you’ll roll a 1d6 dice for a dud. Roll a 1 or 2, well, you are out of luck. It might have hit, but it didn’t explode. Dud. This happened to me at least three times in two patrols. It was a fact — the U.S. Navy had a torpedo problem. Clay Blair Jr.’s magisterial book Silent Victory: The U.S. Submarine War against Japan made this clear:

“…[T}he submarine force was hobbled by defective torpedoes.  Developed in peacetime but never realistically tested against targets, the U.S. submarine torpedo was believed to be one of the most lethal weapons in the history of naval warfare.  It had two exploders, a regular one that detonated it on contact with the side of an enemy ship and a very secret “magnetic exploder” that would detonate it beneath the keel of a ship without contact.  After the war began, submariners discovered the hard way that the torpedo did not run steadily at the depth set into its controls and often went much deeper than designed, too deep for the magnetic exploder to work.”

Blair notes that not until late 1943 would the U.S. Navy fix the numerous torpedo problems.

For my recent game play, I decided to play as Lieutenant Commander Slade Cutter, USN. Cutter, who originally intended to be a professional flutist, ended the war with four Navy Crosses, two Silver Stars, a Bronze Star with combat “V,” and a Presidential Unit Citation. He sank over 140,000 tons of Japanese shipping. In two hours of gameplay I couldn’t come close to that number. But we had a good run. I played the first two patrol areas listed on Cutter’s captain card: The Marianas and The Marshall Islands.

SLUG: ME/Cutter-ob DATE SHOT: 07/27/1944 (Downloaded 06/12/2005 by EEL) CREDIT: AP Photo/U.S. Navy CAPTION:Admiral Chester W. Nimitz pins the Navy Cross on Lt. Cmdr. Slade Cutter, right, for his exploits as a submarine skipper in raids against Japanese shipping on July 27, 1944 at a ceremony in San Francisco. Lt. Cmdr. Cutter of Vallejo and Hollywood, sank 18 Japanese ships, during three successive patrols in enemy-controlled waters. Cutter was also awarded two gold stars in lieu of second and third Navy Crosses.
U.S. Navy Admiral Chester W. Nimitz pins the Navy Cross on Lt. Cmdr. Slade Cutter, right. AP Photo.

To summarize two patrols and two hours of play, these were the highlights:

  • I encountered an escorted ship in The Marianas.  I rolled a dud for one MK 18 but assigned enough torpedoes to sink the freighter and its escort on subsequent rolls.
  • I encountered an aircraft.  I rolled a successful crash dive and staved off any damage.
  • I was rebased to Australia following a “random event” roll.  (These may occur once in a patrol.)
  • I refit my submarine when I rebased in Australia.
  • On my Marshall Islands patrol I encountered a three ship convoy with an escort.  I sunk all three merchant vessels, but had to finish the last merchant vessel off with the deck gun (5”) — which I assigned at the last moment.
  • I encountered a warship which I decided not to engage.
  • And I returned to base after two successful patrols and earned two battle stars, a navy cross, and rolled for promotion to Commander — which was successful.
tons
After two patrols I sunk 8 ships that totaled 28,200 tons. A few got away…

I was fortunate. During my two patrols, when I encountered escorts and rolled for detection, I always rolled “no detection.” If I had been detected, I would have had to roll for depth charge destruction. This includes flooding, damage to systems, hull damage, and sailors injured or killed. Not good. But I managed to get everyone back home after two patrols with all fingers and toes. Still, the risk was there every time I decided to engage a convoy with escorts. So, why is this game so much fun?

Conclusion

There are three reasons why this game succeeds.  

First, historical accuracy. From the problems with torpedoes, to the detailed lists of Japanese merchant and capital ships, or to the specific weapons load out of each U.S. submarine in WWII, it is all there. The makers of this game did not cut any corners. They did their homework and tried, I think successfully, to incorporate significant historical facts into the gameplay.

Second, a risk/reward based gameplay experience. Every decision you make — from the torpedoes you use to deciding if you want to attack submerged and at close or long distance — incurs risk.  There are numerous tradeoffs. For instance, you can attack from long distance submerged, but you suffer a roll modifier and risk not hitting your target. Or, you can be aggressive, and attack at close range, surfaced at night, which may increase your chance of hit but also increase your chance of detection. It just depends.  

Finally, simple game rules.  Complicated games are no fun to play. As a player, I don’t want to spend 10 minutes looking up rule after rule in a rulebook the size of a encyclopedia. In Silent Victory,  the designers have done us a favor. The rules are clearly written and extensive, and after a single read through I referred to them occasionally. But more important, the combat mat has the dice roll encounter procedures printed on it, all within easy view. Also, the other mats all have reference numbers and clearly identify which dice should be rolled for what effects. It is all right there on the mats. This makes for a fun, smooth playing experience. And finally, if I were add another reason why this game is worth your money, it is the game’s replay value. You can conduct numerous patrols and no two patrols will ever be the same.

Silent Victory is a fun naval wargame that will appeal to the novice or expert gamer – and maybe you’ll learn something along the way.

Lieutenant Commander Christopher Nelson, USN, is a staff officer at the U.S. Pacific Fleet in Pearl Harbor, Hawaii. The opinions here are his alone and do not necessarily reflect those of the U.S. Navy or the Department of Defense.