This looks gripping. Amazing trailer:

Here's the synopsis from the official website:

THE KILL TEAM goes behind closed doors to tell the riveting story of Specialist Adam Winfield, a 21-year-old infantryman in Afghanistan who attempted with the help of his father to alert the military to heinous war crimes his platoon was committing. When his father's pleas for help went unheeded, Adam was left to face his scornful platoon members, who threatened to silence him - permanently. Forced to choose between his conscience and his own survival, Adam finds himself drawn into a moral abyss, forced to make a split-second decision that would change his life forever.

With extraordinary access to the key individuals involved in the case – including Specialist Winfield, his passionately supportive parents, and Winfield’s startlingly candid compatriots —THE KILL TEAM is an intimate look at the personal stories so often lost inside the larger coverage of the longest war in US history.

(H/t Slashfilm.)