The code under which the airmen of the 256th Squadron exist is embodied in the theme of Catch-22.As a general rule covering most behavior, it establishes that the men who fight the war are going to have to do what those in authority tell them; and there is no way out of that. Doc Daneeka explains the concept to Yossarian in Chapter 5 when Yossarian asks if his tent mate, Orr, can be grounded. Anyone who is crazy can be grounded. Doc says that Orr certainly could be grounded, but first he would have to make a request. Orr doesn't make that request because he's crazy — he'd have to be crazy to keep flying missions. But if he asked to be grounded, that would mean he is sane. Anyone who wants out of combat duty isn't really crazy and thus cannot get out:
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