We never hear the sound, if any, of those indoor salutes, as with Trump. As I recall there could be a third person, NCO maybe, calling cadence, and if a qualifying dignitary shows up there could be something like: Att-ten-shun——sa-—lute. We never get to see what’s around the corner?
These guys are from 8th and I Marine Barracks, Home of the Silent Drill Team. These Marines aren't on that team, but the drill competency of that whole unit is unreal. They probably haven't heard a cadence except for fun for years.