For those who have never seen it, or are wondering what Carl and I are talking about, here's a video of the changing of the guard at the Tomb of the Unknown Soldiers at Arlington National Cemetery in Washington DC.
Remember that here in the USA we have no Monarch, so this is the closest we come to such a ceremony. The Tomb of the Unknown houses presently the remains of three US soldiers from three wars (WWI, WWII, & Korea) who were unidentified. They represent all the others who were likewise unable to be IDed. There was once another from Vietnam who was just recently IDed through DNA testing and his remains were then buried by his family.
The tomb is guarded 24 hours a day, 365 days a year regardless of the weather. In fact a few years ago they were given permission to stand down when a hurricane was approaching, but they refused!
It is considered one of the highest honors to serve as a ceremonial guard at the Tomb of the Unknowns. Fewer than 20% of all volunteers are accepted for training and of those only a fraction pass training to become full-fledged Tomb Guards. The sentinels do not wear rank insignia on their uniforms so that they do not outrank the Unknowns, whatever their rank may have been. Soldiers serving in other roles, like Relief Commander and Assistant Relief Commander, do wear insignia of their rank when changing the guard only. They have a separate uniform worn when they actually guard the Unknowns or are "Posted".
There is a meticulous ritual the guard follows when watching over the graves:
1. The soldier walks 21 steps across the Tomb. This alludes to the 21-gun salute, which is the highest honor given to any military or foreign dignitary in America. His weapon is always on the shoulder opposite the Tomb (i.e., on the side of the gallery watching the ritual).
2. On the 21st step, the soldier turns and faces the Tomb for 21 seconds.
3. The soldier then turns to face the other way across the Tomb and changes his weapon to the outside shoulder.
4. After 21 seconds, the first step is repeated.
This is repeated until the soldier is relieved of duty with the Changing of the Guard.
Arlington Cemetery Changing of the Guard (Full Ceremony)
PS: Early in this video, you can hear gunshots and a bugle playing "taps". Arlington is an active cemetery so there was obviously an interment in progress which featured full military honors.