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WASHINGTON, DC - MAY 26: A member of the 3rd U.S. Infantry Regiment, 'The Old Guard,' places a flag at a grave site during the 'Flags-In' ceremony May 26, 2016 at Arlington National Cemetery in Arlington, Virginia. A small American flag was placed one foot in front of more than 220,000 graves in the cemetery to mark Memorial Day. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - MAY 26:  A member of the 3rd U.S. Infantry Regiment, 'The Old Guard,' places a flag at a grave site during the 'Flags-In' ceremony May 26, 2016  at Arlington National Cemetery in Arlington, Virginia. A small American flag was placed one foot in front of more than 220,000 graves in the cemetery to mark Memorial Day.  (Photo by Mark Wilson/Getty Images)