'FLAGS IN' Army Pfc. Johnny Allen places an American flag in front of a marker during the “Flags In” tradition at Arlington National Cemetery in Arlington, Va., May 21, 2015. Allen is assigned to the 3rd U.S. Infantry Regiment, known as “The Old Guard.” SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 118992-I-BDN97-494.jpg Photo Gallery