Hi,
I am really note sure in details about rules of british army and it's different regiments.
Yes, sometimes due to more severe body moments or due to accute physical training we have to cover our heads with small keski instead of full turban. e.g. I was a hockey player and while playing hockey, I used to wear a simple handkerchief on my crown (Zoora). cricketers like Monty Panesar, Harbhajan Singh wear patka/keski while playing cricket. Is this army training a similar scenario.
Regards
Amarpreet Singh
www.pagrihouse.com