The First Sea Lord and Chief of Naval Staff of the British Royal Navy, Adm. Sir George Zambellas, center, attends a brief alongside Laura DeSimone at the Missile Defense Agency at Dahlgren, Va., July 29, 2014. Zambellas is taking part in the Commandant of the Marine Corps' Counterpart Program, which invites foreign military leaders to visit the United States and interact with U.S. military leaders. (U.S. Marine Corps photo by Cpl. Michael C. Guinto/Released) Note: portions of this image have been blurred for security.