AkrotiriBadBoy and KM-H,
You have just reminded of Sgt Rose! He was the DI during my Fitters course in '82 (maybe 81). Being hairy ar**d SACs we knew how to play the game and had some great fun. Even if we ended up in the kitchens for jankers it was somehow worth it!
I once ended up alone with him in some NAFFI break area and, after he had removed his cap, we had a long chat about life and the universe etc. Nice guy.