SEA OF JAPAN (Nov. 20, 2020) Gunner�s Mate 3rd Class Timothy Blake, from Detroit, prepares to conduct tactical room-clearing during an active shooter training drill aboard the Arleigh Burke-class guided-missile destroyer USS John S. McCain (DDG 56). McCain is assigned to Destroyer Squadron (DESRON) 15, the Navy�s largest forward-deployed DESRON and the U.S. 7th Fleet�s principal surface force. (U.S. Navy photo by Mass Communication Specialist 2nd Class Markus Castaneda)