War brings many horrors — some of them from your own side.

A24 dropped the trailer Tuesday for "The Kill Team," which was written and directed by Dan Krauss based on his 2014 documentary of the same name.

It centers on Andrew Briggman (Nat Wolff), a young American soldier serving in Afghanistan in 2009. He witnesses the killing of innocent civilians under the command of Sergeant Deeks (Alexander Skarsgård).

When Andrew considers reporting the war crimes up the chain, he feels his own team turning against him — and fears that he might be their next target.

The documentary chronicled the actions of a rogue band of American soldiers, led by Sgt. Calvin Gibbs, who killed at least three Afghan civilians. Spc. Adam Winfield, a member of Gibbs’ squad, tried to report the crimes through his father, but was later charged and pled guilty to manslaughter.

"The Kill Team" opens in theaters October 25.