200622-N-AJ005-1045 PHILIPPINE SEA (June 22, 2020) Gas Turbine Systems Technician (Mechanical) 3rd Class Bryan Changking, from Augusta, Ga., prepares a fuel sample for flashpoint testing during an engineering drill onboard the Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89). Mustin is underway conducting operations in support of security and stability in the Indo-Pacific while 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 Cody Beam/Released)