...indeed. It happens way too often. But soldiers are guilty of the same thing. In the end it has to do with shitty marriages. One or the other would have started cheating regardless of a military deployment.
Now, in my opinion, if something did happen, the wife is the one who deserves a 'bitch' slapping. We don't know what she told the other guy about her marriage. Either way, she should not be hanging out with another guy. Buy a vibrator...