I don't see why this one should be an issue. Your protagonist is US military, not Al-QaedaRather miffed about the whole 9/11 thing?
I don't see much of the issue.Because I think the way they think would determine their course of actions on the strange new world. Admittedly, I already have some ideas and they are mostly unconnected to the American soldiers' mentality and more with the situation on the ground, but still.
Americans doesn't care much about realism, only about their ego, as long as they are displayed in positive way they don't care.
SB doesn't care about realism, they only care about their rules.
SV doesn't care about realism, only about their politics.
QQ doesn't care about realism, as long as it ends with hentai plot.