Haven't seen it but...
...from what I can gather from the promotional stuff and the reviews is that this film is not commenting on war at all, but rather American culture, and the fantasy and myth making it breeds.
The line in the trailer from Steve Martin, "it's no longer YOUR story, it's America's story" says it all. These soldiers have experienced something very personal that most people will never experience and America hijacks it for their own purposes; to bolster national pride, for political reasons, and to ensure young men and women keep signing up for military service.
Reminds me of 'Flags of our Fathers', which sends much the same message.
One of the most poignant images in the trailer is the one that sees the soldiers standing behind Destiny's Child and the dancers; behind them! That image alone speaks volumes about American values - not all Americans of course, but the dominant culture of the US.
This film looks to be about how soldiers are used in American culture to promote a fictional ideal, and perhaps suggesting that they deserve a lot better.
Regardless, I will be seeing it.
How'd I do?