The movement is also done for church services; these are sometimes conducted with the troops standing on the parade square. Perhaps a better word would be "drumhead" service, as often in this case, the drums are piled to make an altar. I‘ve seen this done during the Presentation of Queen‘s Colour for our unit in 1990, when the new Colour was consecrated with the troops on parade, drums piled and regiment standing hatless. We also do it for our annual Walcheren Causeway commemoration parade, where the padre conducts a service with the troops on parade.
The headdress is also removed to give three cheers, commonly done on Change of Command parades.
Here‘s a trivia question - when giving three cheers, what is an extra cheer called?