Although the film begins with the words "This film is inspired by real events, but the story is pure fiction, and there is no intention to insinuate others." But in fact, the film is based on a real historical event, not only the case of Blaise v. Hayes mentioned many times in the film, but also the case of confidential documents of the Pentagon.

The following link is a very detailed introduction to the historical background of the supremacy of truth. I tried to copy it. It's a pity that Baidu showed that there was something in my answer that was not suitable for publication. Without freedom of speech, it's annoying. It really responded positively to the call of the motherland. Let's tape up the whole country.

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