Only You Can See This: What you really need to read is SAS: Rogue Heroes by Ben McIntyre, which details the birth of the SAS in WWII in great detail.  Fascinating book and an entertaining read, recently made into a series by the BBC (also recommended).

SpaceMonkey-66: Years ago when I was younger, I read a book called reach for the sky. It was about the English pilot Douglas Bader, who shot down around two dozen German planes all the while having no legs from a previous accident. He got sent to Colditz castle after repeated escape attempts. He detailed a lot of these antics that these guys used to pull as well.  it's out of print now but there are other books that detail his life, if you find that book though it's well worth the read

What he doesn't tell you in that book was how much his fellow prisoners disliked him.  He lost his legs when he was showboating in a biplane, doing a barrel roll so close to the ground that the wingtip dug into the ground which caused it to crash.  Pompous, big-headed and a general PITA who, due to his disability, enjoyed winding up the goons every chance he could in the name of sport, because there was no way he'd ever be allowed to escape as he'd get caught almost immediately for obvious reasons.  That had the effect of making the German guards take their displeasure out on the rest of the other prisoners and giving the escape committees massive headaches.