U.S. Navy Aviation Structural Mechanic 2nd Class Cassie Renfro, assigned to Helicopter Sea Combat Squadron 7, performs maintenance on an MH-60S Knighthawk helicopter in the hangar bay of the aircraft carrier USS Harry S. Truman in the Gulf of Oman, Sept. 29, 2013. The Harry S. Truman was underway in the U.S. 5th Fleet area of responsibility supporting maritime security operations, theater security cooperation efforts and missions supporting Operation Enduring Freedom.