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Countdown is a 1967 science fiction film directed by Robert Altman, based on the 1964 novel The Pilgrim Project by Hank Searls. Made before M*A*S*H, the film was subject to re-editing by the studio. Countdown stars James Caan and Robert Duvall as astronauts vying to be the first American to walk on the Moon as part of a crash program to beat the Soviet Union. imdb.com