180212-N-NW827-173 ATLANTIC OCEAN (Feb. 12, 2018) Sailors participate in a live-fire exercise on a catwalk aboard the aircraft carrier USS Harry S. Truman ((CVN 75). Truman is underway for composite training unit exercise (COMPTUEX), which evaluates the strike group's ability as a whole to carry out sustained combat operations from the sea, ultimately certifying the Harry S. Truman Carrier Strike Group for deployment. (U.S. Navy photo by Mass Communication Specialist 1st Class Stephen Oleksiak/Released)