The Commandant of the U.S. Marine Corps, Gen. James F. Amos, watches British Royal Guards with the Household Division perform during the Colonel's Review ceremony at Horse Guards Parade in London, England, June 9, 2012. The annual event is held as a final dress rehearsal a week before the Trooping the Colour ceremony in honor of the Queen's birthday. (U.S. Marine Corps photo by Sgt. Mallory S. VanderSchans/Released)