Doc Daneeka Explains Catch-22

Yossarian pleads with Doc Daneeka to ground him on grounds of insanity. Doc Daneeka explains Catch-22: a concern for one's own safety in the face of real danger is rational, so anyone who wants to get out of combat duty is not truly crazy. Therefore, Yossarian cannot be grounded. The catch is a perfect, circular logic that traps everyone. Yossarian is deeply impressed by its elegant absurdity, recognizing it as the defining principle of the military bureaucracy that is systematically trying to kill him.