British Royal Marine Attache Col. Al Lister, center, and Maj. James Knight, right, view a U.S. Marine Corps MV-22 Osprey tilt-rotor aircraft at Marine Corps Base Quantico, Va., July 22, 2014. The Commandant General of the British Royal Marines, Maj. Gen. Martin Smith, not shown, is on his first trip to the United States since assuming the role of commandant. (U.S. Marine Corps photo by Staff Sgt. Brian Lautenslager, HQMC Combat Camera/Released)