'FLAGS IN' Army Pvt. Aaron Johnson places a small American flag in front of a grave during the annual "Flags In" event to commemorate Memorial Day at Arlington National Cemetery in Arlington, Va., May 24, 2012. Johnson, assigned to the Army's 3rd U.S. Infantry Regiment, "The Old Guard," was one of several soldiers to place flags in front of more than 260,000 gravestones and about 7,300 niches at the cemetery's columbarium. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 613492-B-UCQ90-356.jpg Photo Gallery