Upon first learning of the book in 2007, Berg arranged several meetings with Luttrell to discuss adapting the book to film. Universal Pictures acquired the film rights in August 2007, after bidding against other major studios. In re-enacting events, Berg drew much of his screenplay from Luttrell's eyewitness accounts in the book, as well as autopsy and incident reports related to the mission. After directing Battleship (2012) for Universal, Berg resumed working on Lone Survivor. Principal photography began in October 2012 and concluded in November, after 42 days. Filming took place on location in New Mexico, using digital cinematography. Luttrell and several other Navy SEAL veterans acted as technical advisors, while multiple branches of the United States Armed Forces aided the production. Two companies, Industrial Light & Magic and Image Engine, created the visual effects.
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