Pvt. Brian Engelhard, 3d U.S. Infantry Regiment (The Old Guard), Hotel Company, places American flags at headstones in Section 64 of Arlington National Cemetery during “Flags in,” May 21, 2015, in Arlington, Va. The Old Guard has conducted “Flags-in,” when an American flag is placed at every headstone, since 1948. (U.S. Army photo by Rachel Larue/released)