U.S. Navy Gunner's Mate 1st Class Jeremy Greene, second from right, conducts training on the operation of a .50-caliber machine gun with Airman Apprentice Kathryn Brock during a weapons qualification shoot aboard the aircraft carrier USS Harry S. Truman (CVN 75) in the Gulf of Oman Jan. 5, 2014. The Harry S. Truman, the flagship for the Harry S. Truman Carrier Strike Group, was deployed to the U.S. 5th Fleet area of responsibility conducting maritime security operations and theater cooperation efforts in support of Operation Enduring Freedom. (U.S. Navy photo by Mass Communication Specialist 2nd Class David Didier/Released)