Tomb of the Unknown Soldier

ARLINGTON, Virginia — A soldier stands guard in the falling snow at the Tomb of the Unknowns at Arlington National Cemetery in the snow. The guard on duty engages in a set routine in which he marches 21 steps down the black mat behind the Tomb, turns, faces east for 21 seconds, turns and faces north for 21 seconds, then takes 21 steps down the mat and repeats the process.