looking for a webm where a bunch of british officers report to

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looking for a webm where a bunch of british officers report to some other officer in a funny way. they charge into the room i think yelling "sergeant sergeant sergeant" and at first you think it's a monty python skit but is apparently a real thing that happens in the actual british military. there's an announcer that i think says that they exit the room by a door that open almost magically or some other shit. can't find it anymore and never saved it but it was pretty funny