While David Stirling was a junior officer serving in the commandos, he devised the idea of the SAS. He was convinced that that the tactic of using small groups of well-trained, well-armed troops to raid behind enemy lines was a key element in defeating the Nazis. His unswerving conviction was such that he pulled every string and used every contact to get his way. His persistence paid off and he was finally given leave to form 1 Special Air Service Regiment. http://www.telegraph.co.uk/news/newstopics/britainatwar/8784604/Britains-SAS-heroes-Battles-of-the-brave-behind-the-lines.html