The Navy has successfully completed one of its largest war drills spread over Indian Ocean, Arabian Sea and the Bay of Bengal region and involvingits frontline assets such as INS Chakra and 75 combat andsurveillance aircraft.Admiral Devendra Kumar Joshi resigned as Chief of Naval Staff following the sinking of INS Sindhurakshak in which 18 personnel died after the explosion apparently in its torpedo section.But Defence Minister A K Antony didn't resign over moral or ministerial responsibility.