President Barack Obama and Vice President Joe Biden, accompanied by Maj. Gen. Michael S. Linnington, Commander of the U.S. Army Military District of Washington, listen to Taps after placing a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013. (AP Photo/Susan Walsh)

Associated Press
President Barack Obama and Vice President Joe Biden, accompanied by Maj. Gen. Michael S. Linnington, Commander of the U.S. Army Military District of Washington, listen to Taps after placing a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013.  (AP Photo/Susan Walsh)
President Barack Obama and Vice President Joe Biden, accompanied by Maj. Gen. Michael S. Linnington, Commander of the U.S. Army Military District of Washington, listen to Taps after placing a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013. (AP Photo/Susan Walsh)
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