170510-N-AZ808-054 PACIFIC OCEAN (May 10, 2017) The guided-missile destroyer USS Preble (DDG 88) launches an SM-2 missile during a group sail training unit exercise with the Theodore Roosevelt Carrier Strike Group. Group sail is the first step in Preble’s training phase and aims to enhance mission-readiness and warfighting capabilities between the ships, air wings and the staffs through simulated real-world scenarios. (U.S. Navy photo by Ensign Justin Villasenor/Released)