Well, I can understand why some of them WOULD be upset about it. It is a touchy subject, and obviously people have been affected by it in different ways.
I just wonder if they stress enough that the game is based on REAL LIFE and not just a game like Call of Duty (yes, you can argue the games are based on real events - at least 3arcs games) but it's still a bit difficult to really please everyone. That's why I think if there were statements from actual Marines stating WHY they're okay with it, it might put the game in a better light.