In the 1960s I was a part of the American contingent for the retirement parade for German General Hepp, finally calling it quits after 50 years service with Reichswehr, Wehrmacht and Bundeswehr. I got to wear multiple hats, including interpreter for our battalion commander and playing tank commander [no gunner needed, no blank 105 salute rounds being available] and elevating the main gun and commander's cupola .50 to full elevation to Event Control radio command Achtung, präsentiert das Gewehr [attention, present rifle] as we passed by the reviewing stand in a 3-tank frontal attack wedge formation.Both our 105mm main gun [M60A1 tank] and the M85 .50 roofgun had rifled barrels, so I guess it was a rifle salute of a sort....
It would be kind of neat to see some bodybuilding moose try to do Queen Ann's Drill with an M2, though. He'd have to be awfully tall for that barrel to clear the ground during the rifle-spin/twirl....FANCY, one rifle spin, HUP!