Mechanical Soldiers dressed in impeccable blue adorned with shinning medals rigidly carry rifles up and down the worn paths of the plaza at the Tomb of the Unknown Soldier in Arlington National Cemetery, Va., daily.

The Honor Guard sentinels assigned to Headquarters and Headquarters Company, 4th Battalion, 3rd U.S. Infantry Regiment, are there 24 hours-a-day, 365 days-a-year. People come year round to witness the precise changing of the guard at .

Yet, these mechanical sentinels have a human side to them that vistors seldom see. Here is an inside look at the awe-inspiring sentinels.

Includes soundbites of Staff Sgt. Kevin M. Gilliam - commander of the first relief, "The Old Guard," Staff Sgt. Ryan G. Spacht - Bugler, U.S. Army Ceremonial Band, Madeleine Willis - visitor to the Tomb of the Unknown Soldier. (By U.S. Army Staff Sgt. Mark Burrell)

j vimeo.com/24158146

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