Chest only of Tomb of the Unknown Soldier Sentinel

The Tomb of the Unknown Soldier is Arlington National Cemetery's most iconic memorial. The neoclassical, white marble sarcophagus stands atop a hill overlooking Washington, D.C.

The Sentinels of the Tomb of the Unknown Soldier stand watch 24 hours a day, 365 days a year, in any weather. Sentinels, who volunteer for this post, are considered the elite of the elite 3rd U.S. Infantry Regiment (The Old Guard), headquartered at nearby Fort Myer, Virginia.