<Li> Turns and faces east for 21 seconds . </Li> <Li> Turns and faces south, changes weapon to outside shoulder, and waits 21 seconds . </Li> <Li> Repeats the routine until the soldier is relieved of duty at the Changing of the Guard . </Li> <P> After each turn, the guard executes a sharp "shoulder - arms" movement to place the weapon on the shoulder closest to the visitors to signify that the guard stands between the Tomb and any possible threat . </P>

Tomb of the unknown soldier arlington changing of the guard