US President Barack Obama(C) escorted by Military District of Washington commanding general, Major General Michael Linnington, pause for a moment of silence during a wreath laying ceremony at the Tomb of the Unknown Soldier May 28, 2012 to mark Memorial Day at Arlington National Cemetery. Memorial Day is observed in remembrance for those died while serving in the US military. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/GettyImages)
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