Standing guard at the Tomb in the face of Hurricane Irene

WASHINGTON - As Hurricane Irene barrels her way toward the mid-Atlantic and up the East Coast, members of The Old Guard continue their vigilance at the Tomb of the Unknown Soldier.
While on duty the Tomb Sentinel crosses a 63-foot rubber surfaced walkway in exactly 21 steps. He then faces the Tomb for 21 seconds, turns again, and pauses an additional 21 seconds before retracing his steps.
 
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News source WTOP 103.5.