It is in reference to the 21 Gun Salute.
The significance of the number 21 at Arlington National Cemetery is the way they guard the "Tomb of the Unknowns". They walk 21 steps, pause for 21 seconds, and then walk 21 steps the other way. They get this from the 21 gun salute.
The Changing of the Guard - album - was created on 2010-08-10.
The guards take 21 steps, an allusion to the 21 gun salute which is the highest honor given any military or foreign dignitary.
Twenty-One paces, refering to the 21 Gun Salute. He takes 21 steps, with the rifle facing away from the tomb, pauses for 21 seconds, and then switches the rifle to his other shoulder, and then walks 21 steps once again and repeats the process for 30 minutes, and then guards switch.
Changing of the Guard - 1936 was released on: USA: 6 June 1936
Changing of the Guard - 1936 is rated/received certificates of: USA:Approved (certificate #2101)
Coast Guard Alaska - 2011 Changing of the Guard 2-11 was released on: USA: 19 December 2012
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The cast of Changing of the Guard - 2004 includes: John Fremont as Jimbo Gordon Jump as Earl