SOUTH CHINA SEA (Nov. 14, 2020) A Sailor fires a mark-38 25mm gun from a remote operator console in the pilot house during a live-fire gunnery exercise aboard the Arleigh Burke-class guided-missile destroyer USS John S. McCain (DDG 56). John S. McCain is assigned to Destroyer Squadron Fifteen (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)