I just read about this for the first time today and, I have to say, it makes me a little uncomfortable. A TV show or a comic is very different from a video game. Those are passive forms of entertainment: a story is being told to you and you're not involved except as the viewer. A video game puts you right into the action and makes you a part of it. It'd feel awkward and disingenuous for me to be pretending to be a soldier behind the comfort of my TV screen in a real situation where real soldiers probably gave their lives and call it entertainment.
But that's just me and my personal discomfort. I don't find the game as a whole particularly scandalous because, as others have pointed out, we've skirted close to this in the past with Iraq-based shooters already, where the only difference is that the producers made the situations up--and even then, a firefight is a firefight, so they probably weren't far off from real engagements that they looked at for research anyway. If soldiers are themselves contributing to this game, I can only assume its creation is okay with them, and if they're okay with it, I'm certainly in no position to act as some kind of higher moral authority. It just makes me, personally, a little squeamish.