A 3d U.S. Infantry Regiment (The Old Guard) Tomb of the Unknown Soldier Sentinel conducts his last walk at the tomb, located at Arlington National Cemetery, Va., Dec. 6, 2016.
Sentinels guard Tomb of the Unknown Soldier 24 hours a day, 365 days a year, and in any weather. The men and women, all volunteers, are considered to be the elite regiment's best Soldiers.
#USArmy photo by Sgt. Cody...
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