EAST CHINA SEA (April 1, 2021) Sailors train with M-9 pistols during a small arms gun shoot on the flight deck of the Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89). Mustin 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 3rd Class Arthur Rosen)