190220-N-JX484-289 NORTH SEA (Feb. 20, 2019) The guided-missile destroyer USS Gravely (DDG 107), the German navy replenishment tanker FGS Spessart (A 1442), right, and the Polish navy guided-missile frigate ORP General K. Pulaski (FrR 232) conduct surface exercises in the North Sea. 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)