SOUTH CHINA SEA (Jan. 7, 2021) Cryptologic Technician (Technical) 3rd Class Tristan Marshman, from West Palm Beach, Fla., prepares to close a watertight hatch during a damage control training team 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)