What is CATCH 22 situation?
The prototypical Catch-22, as formulated by Heller, involves the case of John Yossarian, a U.S. Army Air Forces bombardier, who wishes to be excused from combat flight duty. In order to be excused, he must submit an official medical diagnosis from his squadron's flight surgeon, demonstrating that he is unfit to fly because he is insane. In fact, according to regulations, any sane person would naturally not want to fly combat missions because they are so dangerous. However, by requesting to have one's sanity evaluated, the airman demonstrates that he is in fact sane and therefore is fit to fly because one has to be sane to recognize one's own insanity.