U.S. President Barack Obama (2nd R) and Commander of the Military District of Washington U.S. Army Major General Karl Horst (R) arrive to lay a Memorial Day wreath at the Tomb of the Unknowns at Arlington Cemetery in Arlington, Virginia, May 30, 2011. Also pictured is first lady Michelle Obama (3rd R). REUTERS/Jonathan Ernst (UNITED STATES – Tags: POLITICS MILITARY)