SEA OF JAPAN (Nov. 20, 2020) Chief Hospital Corpsman Darsean Sharpe, left, from Atlanta, gives medical training to Sailors 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)