"It will end, soon. But before it does, a lot more people have got to die," says Pitt, 50, who plays a sergeant named Wardaddy in the flick. Pitt's platoon includes Shia LaBeouf, Michael Pena, Jon Bernthal, Scott Eastwood, and Logan Lerman.
Pitt has tackled WWII before, of course, in Inglourious Basterds. But in this film, which hits theaters Nov. 14, he has a much more haunted yet defiant look.
"He's playing this badass, hard, tough, intense guy. It's a different kind of role for him," director David Ayer told PEOPLE in May. "He's insanely good in this thing."
Ayer said he wanted to make "the ultimate tank movie. Everyone's done D-Day, these big battles of the war, but no one's really told the life of the spearhead of the U.S. Army of the time, which was these tank crews. It's a great opportunity to take a group of guys, put 'em in this claustrophobic environment, and see how they work together as a team."
In related news Pitt and Peter Capaldi are teaming up to help a group of students whose building partially burnt down. The pair are fundraising money in order to help restore Glasgow School of Art's fire-hit Mackintosh building.
"But more than that it is a symbol of where art belongs, rising as it does out of the heart of a great city. A mighty castle on a hill, it is a part of me, and of all Glaswegians."
In a specially recorded message for the students Capaldi said: "I'm so sorry for all of you who have lost your degree shows.
"All I can say to you is that you are artists. This will only add to your story. You will be reborn, and rise from the ashes even stronger."
GSA director, Professor Tom Inns, Pitt and Capaldi would have an important role to play in the fundraising appeal. .
He said: "We are delighted that both Peter Capaldi, one of our most celebrated alumni, and Brad Pitt, whose admiration for Mackintosh is well known, have both joined our campaign and will be Trustees on The Mackintosh Appeal."