Although the screenplay is credited as being adapted from Kyle's book of the same name, screenwriter Jason Hall claims that he began researching the screenplay and met Chris Kyle before the book was completed and published, and he continued to interview Kyle's widow on further details after his death. Hall concluded of the book: "I absolutely knew there was more to this guy than was in those pages. It didn't really get into what happened when he came home, and what going to war had cost him. I wanted to take a deeper look at that."

Film

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