150731-N-XX566-001 PACIFIC OCEAN, (July 31, 2015) The Arleigh Burke-class destroyer USS Chung Hoon (DDG 93) pulls alongside USS John C. Stennis (CVN 74), not pictured, for a replenishment-at-sea. The John C. Stennis Carrier Strike Group is undergoing a composite training unit exercise, the final step before being certified for deployment. (U.S. Navy photo by Mass Communication Specialist 3rd Class Andre T. Richard/Released)