The Catch-22 ParadoxThe logical trap that prevents escape from combat, central to the novel's critique of bureaucracy.1First explanation by Doc DaneekaEarly in the story, after Yossarian's hospital return2Catch-22 and the mission countWhen Yossarian learns he must fly fifty-five missions3Catch-22 and the hospitalDuring Yossarian's hospital stays4Catch-22 and the brothel raidWhen Yossarian learns the brothel was closed5Catch-22 and the dealWhen Colonel Korn offers Yossarian a way home