One day whilst bored half to death and scanning QR's for those funny snippets I found one that stated " If an airman is not wearing his head cover then he is not in uniform" (or words to that effect) This in effect meant that Joe SWO couldn't tell you to put your hat on, as without it you were not in uniform anyway.
I never did get up the courage to try it out.
But if my memory is correct his hair style would preclude the wearing of said hat and therefore couldn't be considered to be in uniform.
Are QR's on the internet yet? They make great reading.
Another one was:
When walking past a female an airman is allowed to keep one hand in his pocket to avoid embaressment to either party.