Just wondering when taking part in a funeral procession, is headgear kept on? If so, is it kept on in church as we are seen as being on duty or is it removed on entry? (If so, how does this work drill wise if still marching as escort?
Same as any other church service. Headgear on while outdoors, headgear off as you enter the church, stand fast split arses.
I doubt very much you'll be marching through the doors of the church, so it'll just be a case of removing your cap as you walk through the door. There should be no need to march inside the church. Just halt before you reach the door then walk into the church.
If you are a pallbearer then you don't wear headgear while carrying the coffin, put it on after you've left the church. If it's an official military funeral, there should be someone to carry the pallbearer's caps and give them back after they've got rid of the coffin.