Joseph Heller didn't like the casting of Jon Voight as Milo
Heller said that Mike Nichols wanted to cast an "Aryan" as Milo, which he felt was utterly wrong, due to his family's having been victimized by the Nazis. Milo is NOT a Nazi, and though he is the mayor of towns and assistant vice-roys and such of places in which he has brought international trade in the novel, he is an American businessman, not the proto-fascist of Nichols conception, at the end of the film (when he rolls into Rome like Hitler or Mussolini during Yossarian's arrest.
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"Why do people always laugh in the wrong places?"
--Nurse Cramer