The First Sea Lord and Chief of Naval Staff of the British Royal Navy, Adm. Sir George Zambellas, first row center, and U.S. Navy Rear Adm. Matthew L. Klunder, first row center right, pose for a photo with Navy officers and civilian personnel in front of the Navy's rail gun at Naval Surface Warfare Center 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)