I once had the pleasure of working with a largely-RAF unit composed mainly of flyers that wore CS95 as their daily uniform...even though they lived within an air-conditioned bunker.
They proudly wore their brevets unashamedly in breach of whatever the rulebook said. I was determined to go and see the CO and say "look, Sir, you do know that brevets are not to be worn on CS95" but I never got round to it...
