Well, I believe the rule that a soldier must first request permission to go home is included in the catch, Catch-22. In Chapter 5, Doc Daneeka explains to Yossarian that there's a Catch. The catch is that Doc Deneeka has to ground someone who is crazy but they have to ask him to ground them. But if they ask him, then they are not crazy anymore and they can't be grounded. In the beginning of my reading I really got confused about the catch. But then realized its suppose to be confusing because the catch has no way out. I believe that no one can be sent home early as a cause of their insanity. The only way you can go home is if you finish all your missions. But Yossarian can never go home because every time he gets close to finishing, the colonel raises the number of missions you have to complete to be able to leave. But if someone could have been sent home because of their insanity I would think that Orr would be the first to get sent home.Doc Daneeka stated in Chapter 5, "He has to be crazy to keep flying combat missions after all the close calls he's had." I would also think someone is crazy if they would keep flying missions and are always close to getting killed but would never complain about doing another mission.