A Collins class submarine sails through the water during a weapons firing serial conducted off of the coast of Western Australia.Anti-Submarine Warfare Exercise (ASWEX) 2010 is an important exercise for the Royal Australian Navy (RAN), providing Submarine and Anti-Submarine (ASW) training and trial opportunities for maritime and air assets. The RAN also takes this opportunity to develop tactics and test weapons and weapons systems in the conduct of ASW.The annual maritime exercise is being held in the Western Australian Exercise Area off the coast of Perth and adjacent air space from 15-26 November 2010.The exercise involves Anzac Class frigates HMA ships Warramunga and Arunta as well as involvement with Collins Class Submarines HMA Submarines Dechaineux and Collins.Air support is being provided by Navy’s 816 Squadron and Air Force’s Maritime Patrol Aircraft from 92 Wing. 816 Squadron is based in Nowra, NSW, whilst 92 Wing are based in RAAF Edinborough, SA. Aircraft and crews have been forward based at HMAS Stirling and RAAF Pearce for the duration of the exercise to provide support to the ships at sea with Seahawk helicopters and Orion PC3 aircraft.