190219-N-JX484-769 NORTH SEA (Feb. 19, 2019) Gas Turbine Systems Technician (Mechanical) 3rd Class Jordan Williams performs a fuel sample test aboard the guided-missile destroyer USS Gravely (DDG 107) during a replenishment-at-sea with the German navy replenishment tanker FGS Spessart (A 1442). Gravely is deployed as the flagship of Standing NATO Maritime Group 1 to conduct maritime operations and provide a continuous maritime capability for NATO in the northern Atlantic. (U.S. Navy photo by Mass Communication Specialist 2nd Class Mark Andrew Hays/Released)