I thought this would be a psychological war film, but it just doesn't get any more contrived, Hollywood, and ridiculous as this.
The director is also the writer, so the blame gets pinned on one person.
Not a single one of the four main characters has one iota of credible motivation. Not one of them. I don't want to put a spoiler in, but the writer just decided to make the outcome whatever he wanted, however Hollywood and predictable it could be.
We see this playing out as a horror story if the survivors return to civilian life, so we know at least one of the two focal point soldiers of this movie will return to civilian life.
Okay, so the two soldiers are insane. We get enough preaching about that. The two characters who deal with insanity later have no credible motivation for anything they do, either.
But the story is the traditional and totally "safe" Hollywood formula of depress and alienate the audience. There are plenty of Beavis and Butthead types who will applaud that, especially from the noted critics circles.
But it is ridiculous. Don't say I didn't warn you.