A U.S. Marine Corps MV-22 Osprey tilt-rotor aircraft sits on the flight line during a capabilities demonstration and test flight at Marine Corps Base Quantico, Va., July 22, 2014. The British Royal Marines Commandant General Maj. Gen. Martin Smith, not shown, and his staff were on hand to view the aircraft. (U.S. Marine Corps photo by Staff Sgt. Brian Lautenslager, HQMC Combat Camera/Released)