SOUTH CHINA SEA (Jan. 12, 2021) Gas Turbine Systems Technician (Electrical) 1st Class Trevor Tebo, left, from Redwood, N.Y., and Electricians Mate 1st Class Robert Dineros, from Temecula, Calif., troubleshoot a simulated casualty in central control station during an engineering training team drill aboard the Arleigh Burke-class guided-missile destroyer USS John S. McCain (DDG 56). 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)