Tomb Sentinel A tomb sentinel assigned to the 3rd U.S. Infantry Regiment, known as the ‘Old Guard,’ stands watch at the Tomb of the Unknown Soldier in Arlington National Cemetery, Arlington, Va., Aug. 9, 2023. SHARE: Download: Full Size (0.66 MB) Tags: Army Credit: Henry Villarama, Army VIRIN: 230809-A-AR102-1070.JPG Photo Gallery