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The working title of this film was MASH 66. The order of names in the opening cast credits differs slightly from the order of the end credits. According to a Los Angeles Examiner news item, the film's title refers to the ability of mobile field hospital units to dismantle and set up their giant tents as quickly as circuses. An article in Hollywood Citizen-News adds that technical advisor Col. K. E. Van Buskirk had commanded one of the first MASH units in Korea. Portions of the film were shot on location in Calabasas, CA, and Camp Pickett, VA. A New York Times news item states that Camp Pickett was chosen because it was actually a training site for MASH units, and could make helicopters available for the production.
The experiences of medical personnel working at the front lines in the Korean War were also the basis for the unrelated 1970 film M*A*S*H (see AFI Catalog of Feature Films, 1961-70) and the popular television series of the same name, which ran on the CBS network from 1972-83.