4 pages and I've yet to see a post counter the argument on the first page that simply says, psychologically men will take unnecessary risks to save a women that they wouldn't do for another man. Someone brought up a great example which I'll rephrase into a question for MEN ONLY. Hell let's use a scenario straight out of movie that ironically involves a women kicking some ass.
Let's say were walking though a tiny town and a sniper wounds your fellow men in the knee. You all duck behind a building but the wounded man is still in the open. The sniper proceeds to torture him with non fatal shots to bait someone to go rescue him and then shoot the rescuer. The man is screaming. How tempted are you to give in and risk to save that man.
Now it's a women screaming instead. Did you just get your self shot?
Now this isn't to say that some men can view some women in equal enough fashion that they can desensitize themselves to women in pain on the same level as seeing a man in pain, but the reality is, most can't. Those in the military are already move protective in general than non military and even more less likely to desensitize themselves.
Even a man so tuff and manly that would not only would he not care if his best friend was shot, he would actually go out of his way to laugh and shoot him for the fun of it would still have a hard time watching a women stub her toe without jumping to her rescue.
Someone did bring up a good point that this psychological affect diminishes with age, but the reality is most of these guys are young.
In a total war, the benefits of women on a front line might be better than the negative effects, since a total war, everyone is more likely to be desensitized, but we haven't had a total war since WWII.