William Peter Blatty - The Ninth Configuration (1980)

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From wikipedia:
The Ninth Configuration, (also known as Twinkle, Twinkle, Killer Kane) is an American-made film, released in 1980, directed by William Peter Blatty (most famous as the author of The Exorcist). It is often considered a cult film and it won the Best Screenplay award at the 1981 Golden Globes. The film is based on Blatty's novel, The Ninth Configuration (1978) which was itself a reworking of an earlier version of the novel, first published in 1966 as Twinkle, Twinkle, "Killer" Kane.

Quote:

Colonel Kane (Stacy Keach), an army psychiatrist suffering from nightmares, arrives at a castle in the American Pacific Northwest where shell-shocked and insane soldiers from the Vietnam war are being treated. The castle's staff has been unable to control the patients, many of whom are suspected of faking their illness to get out of combat. The permissive Kane opens himself up to listen to anything the soldiers have to say to him in an effort to heal them, while at the same time suffering from his own demons.