John Garfield of the last film, based on the life of Al Schmid, a war hero blinded in combat. In preparing for the role, Garfield lived for several weeks with Schmid and his wife in Philadelphia and would blindfold himself for hours at a time. After the war, Garfield starred in a series of successful films such as "The Postman Always Rings Twice" (1946) with Lana Turner, "Humoresque" (1946) with Joan Crawford, and the Oscar-winning Best Picture "Gentleman's Agreement" (1947). In "Gentleman's Agreement", Garfield took a featured, but supporting, part because he believed deeply in the film's exposé of antisemitism in America.
The Beginning or the End actors cast in the movie were best known for film noir : Hume Cronyn for "The Postman Always Rings Twice"; Joseph Calleia, for "Gilda" and "Deadline at Dawn"; and Ludwig Stössel for Fritz Lang's "Cloak and Dagger". Groves's cooperation was secured by hiring him as a primary consultant, for $10,000 (). The portly Groves apparently had no objection to his portrayal by the slim and handsome Donlevy, except for the way in which he was shown bossing industrialists around. He had a scene in which he warned Roosevelt that the invasion of Japan would be opposed by Japanese nuclear weapons