I liked it.
This does not try to be a war movie, though there are some war scenes. This does not try to be an action movie, though there are some action scenes. If you're after a war movie or an action movie, you'll be disappointed.
The movie is about how we get trapped by fear, even when the fear is perfectly rational. It's also about how we can escape from these traps even when doing so might kill us -- actually kill us or just feel like it will kill us. That's the story from this movie. If you don't like that kind of story, you'll be disappointed.
The movie could have been more tightly edited. There were some military details that were off. That's Hollywood. The characters were interesting, the acting and dialogue were decent. Good flick.