PHILIPPINE SEA (March 15, 2021) Operations Specialist 2nd Class Manuel Castillo, assigned to Destroyer Squadron (DESRON) 15, participates in an air defense exercise in the combat information center aboard the Arleigh Burke-class guided-missile destroyer USS John S. McCain (DDG 56). John S. McCain is assigned to Task Force 71/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 1st Class Jeremy Graham)