U.S. President Obama and Vice President Biden wait as Linnington struggles to unchain a fence before they lay a wreath at Tomb of the Unknown Soldier at Arlington National Cemetery near Washington

U.S. President Barack Obama and Vice President Joe Biden wait as U.S. Army Military District of Washington Major General Michael Linnington struggles to unchain a fence before they lay a wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery near Washington, January 20, 2013. REUTERS/Jason Reed

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