"There are pilots and there are pilots; with the good ones, it is inborn. You can't teach it. If you are a fighter pilot, you have to be willing to take risks." Brig. Gen. Robin Olds

US Fighter pilots used to say that there was a glass case in the Pentagon built to the precise dimensions of then-Colonel Robin Olds, who would be frozen and displayed wearing his rankless flight suit, crushed fore and aft cap, gloves, and torso harness with .38 and survival knife. Beside the case, was a fire ax beneath a sign reading :

"In case of war, break glass."

http://www.usafa1961.org/robin_olds.htm