The idea for Catch-22 was based on Joseph Heller's personal experience in World War II. The feelings that Yossarian and the other bomber pilots felt were taken directly from problems he suffered while on duty. Heller flew 60 bombing missions from May to October in 1944. Heller mentions that he should have been killed three times over, since the average death rate was 5% per mission. Heller was able to make it out of the war, but the experience tortured him and it took until 1953 before he could start writing about it. The war experience turned Heller into a "tortured, funny, deeply peculiar human being".
After publication in 1961, Catch-22 became very popular among teenagers at the time. Catch-22 seemed to embody the feelings that young people had toward the Vietnam War. It was joked around that every student who went off to college at the time took along a copy of Catch-22. The popularity of the book created a cult following, which led to over eight million copies being sold in the United States. There are many who feel that "the comic fable that ends in horror has become more and more clearly a reflection of the altogether uncomic and horrifying realities of the world in which we live and hope to survive."