President Barack Obama and Vice President Joe Biden, accompanied by then-Maj. Gen. Michael S. Linnington, commander of the U.S. Army Military District of Washington, arrive to place a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va. on Jan. 20, 2013. Mr. Linnington, the Pentagon's new leader of the search for military members missing from past wars, says he will push for more partnerships with private groups that have resources and interest in the MIA accounting mission. (AP Photo/Susan Walsh, File)
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