Army Honor Guard soldiers, 3rd U.S. Infantry Regiment, known as "The Old Guard.", perform the Changing of the Guard at the Tomb of the Unknown Soldier before participating in a Memorial Day ceremony at Arlington National Cemetery in Arlington, Va., May 25, 2015. Army Honor Guard soldiers, 3rd U.S. Infantry Regiment, known as "The Old Guard.", perform the Changing of the Guard at the Tomb of the Unknown Soldier before participating in a Memorial Day ceremony at Arlington National Cemetery in Arlington, Va., May 25, 2015. SHARE IMAGE: Download Image: Full Size (0.97 MB) Tags: Photo Essays Photo By: VIRIN: 960292-I-SYV91-035.jpg Photo Gallery