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The opening title card reads: "O.S.S., United States Government Office of Strategic Services, Washington, D.C." The foreword to the film states: "While the characters in this motion picture are fictitious, the story is based on a composite of actual incidents in the diversified activities of the United States Office of Strategic Services which conducted intelligence, special operations, and unorthodox methods of warfare in support of allied military operations. It is a tribute to the brave, resourceful men and women, living and dead, who volunteered for these dangerous assignments. [signed] William J. Donovan, Director of Strategic Services."
According to Paramount News items, before Paramount could make this film, the script had to be officially approved by Major-General Donovan, who organized the O.S.S. in 1942. Paramount News reported that with the cooperation of the U.S. government, O.S.S.'s declassified files were opened up for Paramount's inspection, and that many of the factual records were incorporated into the film's script. From hundreds of O.S.S. incidents, writer-producer Richard Maibaum, a former Lieutenant-Colonel in the U.S. Army, took three typical adventures and wove them into the screen story. Technical advisor Commander John M. Shaheen was the former chief of the special projects division of the O.S.S.
A news item in Paramount News states that ex-Army sergeant Edward Cohen, who painted portraits of American officers in Wiesbaden, Germany during the war, was commissioned to paint the oil paintings used in this film. Portions of the film were shot at California Institute of Technology in Pasadena, and on location in Palos Verdes, CA. The film marked the motion picture debut of stage actors John Hoyt, formerly known as John Hoysradt, and Harold Vermilyea. Paramount News also reported that one of Adolf Hitler's sleek black touring phaetons, a streamlined 1937 model Horch, was used in the film. Alan Ladd reprised his role in a Lux Radio Theatre broadcast on November 18, 1946, co-starring Veronica Lake.