I liked this movie very much because, apart from being a good thriller, I believe it is a quite good psychological comment of how people function under extreme circumstances such as war.
Basically the movie introduces few different types of character and then inspects them. Firstly SSgt. James who as he says "loves only one thing..". He is a person who loves war because it gets his adrenalin pumping. Anybody who ever loved doing anything can easily understand what keeps him going, except in his case it is something, hm..., not so nice and widely excepted. This results in creating extremely dangerous situations for all the people (soldiers) that surround him. He is aware of that, and is torn by that fact but he really cannot help himself, he has no choice because he is the way he is. He seeks danger on one end, and when he finds it, he appears to be the best person to be around. A nice touch in the movie was the way in which he tries to rationally "validate" his actions by taking a righteous stand regarding the death of an innocent (not to go into the details)...
Other soldiers are a wide specter of human beings with feelings of regret, fear, compassion etc.. The people who are very much affected by the war and are changed by it. Two supporting roles of Sgt. Sanborn and Spc. Eldridge are well placed in contrast to SSgt. James for being "human". Acting is great, and all the important characters convey their state of mind very well. David Morse was in the movie for just a few seconds and played his role of a "hillbilly cowboy" marvelously as Col. Reed.
A really good movie...