Sgt. Erik McGuire (right), Tomb Sentinel, Tomb of the Unknown Soldier, 3d U.S. Infantry Regiment (The Old Guard), inspects the weapon of a Tomb Guard during a guard change, Aug. 30, 2012 at the Tomb of the Unknown Soldier in Arlington National Cemetery, Va.

Prior to this guard change, McGuire was awarded The Guard, Tomb of the Unknown Soldier Identification Badge.

Tomb Guards must pass a series of tests and training before they earn the right to be called a Tomb Sentinel.

U.S. Army photo by Megan Garcia