The selection programs that others have referred to aimed, in part, to weed out those candidates who "appeared" to show a higher tendency to stress. Might be "cobblers" to you "Beardy" but the results were pretty good. Hamble had a 500 questionnaire followed by interview with a fully qualified Psychologist. Many thought one test was a co-ordination exerrcise. It wasn't. It looked hard at how candidates might re-act once placed in a high stress situation. Might be "cobblers" to you "Beardy" but I know who I'd rather be sitting behind ; someone who passed formal selection or someone who falls apart at selection questions, like, "What is a half divided by a half" when asked in a stress environment. Amazing how many go red in the face and bleat out " A quarter!".