U.S. Secretary of Defense Chuck Hagel, from left, French President Francois Hollande, and Maj. Gen. Jeffrey S. Buchanan, commander of the U.S. Army Military District of Washington, stand at attention after laying a wreath at the Tomb of the Unknown Soldier as 'Taps' is played at Arlington National Cemetery on February 11, 2014 in Arlington, Virginia. 2014 marks the 70th anniversary of the Allied Forces D-Day landing in Normandy, which helped lead to the liberation of France and the European continent.