190227-N-JX484-296 BALTIC SEA (Feb. 27, 2019) Sailors from the guided-missile destroyer USS Gravely (DDG 107) send a fuel sample to an MH-60R Sea Hawk helicopter from the Spartans of Helicopter Maritime Strike Squadron (HSM 70) before a helicopter in-flight refueling exercise. 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)