Soldiers assigned to the Army's 3rd U.S. Infantry Regiment, "The Old Guard," march to the Tomb of the Unknowns as part of the Army's 233rd birthday tribute in Arlington National Cemetery, VA, June 14, 2008. Soldiers assigned to the Army's 3rd U.S. Infantry Regiment, "The Old Guard," march to the Tomb of the Unknowns as part of the Army's 233rd birthday tribute in Arlington National Cemetery, VA, June 14, 2008. SHARE: Download: Full Size (1.91 MB) Tags: Photo Essays Credit: VIRIN: 595795-Q-CJX51-502.jpg Photo Gallery