Film producer Gregg Hale came up with the idea to move the main characters a long way during the day, harassing them by night, and depriving them of food. He used his own memories of military training as inspiration, as such tactics are used in the "Survival, Evasion, Resistance and Escape" (SERE) training program which prepares military personnel for various survival scenarios. The program was established by the U.S. Air Force at the end of World War II, but was later expanded to train personnel of the U.S. Navy and the United States Marine Corps.

Film

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