I remember this Marksmen show, the first part was done with no audio, much like old school military maneuvers. The only audio you heard was the slapping of the rifles, the wind of the flags and the Captain's commands, I remember the timing was quite impressive.
Then "The Show Must Go On" (music of Three Dog Night) During the "fun-house" music segment, the rifles aimed and fired at the flag members, much like the shooting gallery at a carnival.
Their Guard Captain, Jill Hudson later became Drum Major for the Imperials in 1980.