CEREMONY TRADITION President Barack Obama and Army Sgt. 1st Class Chad Stackpole lay a wreath to mark Veterans Day at the Tomb of the Unknown Soldier in Arlington National Cemetery, Va., Nov. 11, 2012. Stackpole, sergeant of the guard for the Tomb of the Unknown Soldier, is assigned to the 3rd U.S. Infantry Regiment, known as "The Old Guard." SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 851442-Q-TBO98-618.jpg Photo Gallery