First of all, let me preface this by saying that women have always served in the military honorably, and always will. But, I cannot even begin to describe how abhorrently I am opposed to putting women in combat roles. I say this with first hand experience having been a combat Infantryman, and having been in field assignments where women worked closely with men.
It doesn't work.
Here's the problem. Take a group of testosterone charged, pumped up, adrenalized, ninteen year old males with a kill em all/F em all attitude, put them in a field environment for days and weeks on end, and put women in their midst. Sleeping beside them, sharing foxholes with them, working with them, playing with them, joking with them, 24 hours a day, 7 days a week.
What do you THINK is going to happen?
Well, males will compete with other males for the females, removing their focus on their job tasks. Relationships will form. Fights will ensue. "Do NOT put PFC Sally on point, Corporal Jake will have your ass!" Morale will go down the tubes. This isn't like a office environment. Existance becomes tribal. Plus, a certain number of outright assaults are going to happen. One only needs to look at documentaries on military life in Iraq and Afghanistan support that.
I guess you could "seeensitize" your male soldiers and make them "neutral" to the females in your unit. Remove their drive. But by doing so you remove their drive to fight and kill too. You can't have it both ways. It doesn't work that way. Is that the kind of fighter you want? You want to send Justin Bieber in hand to hand combat with the Taliban?
When I went to NCO school, it was an all-branch training unit and my company was comprised of some combat arms, and other support groups. We had four females in a forty person platoon. We would rotate leadership positions but I spent the majority of the time in the program as the platoon leader. In the beginning, in admin mode, no real issues, things worked fine. As we moved in to a more intense close-in working mode, and field mode, things started rapidly degrading. The men, from day one, were all trying to vie for a position with the females. Making pairing assignments and duty rosters became difficult, because of the conflicts. There were fights. Threats. The cohesiveness of the unit dissolved. When it was all over with, I thought "This is not the group of people I want to go to war with."
If you haven't been in a combat situtation, you don't understand the mentality that is required to survive and fight effectively. You operate in another mode. You flip a switch. You become an elite killing machine. Along with that all the other urges are intensified and discretion is reduced. Kind of like alcohol. You can't civilly deal with women in that mode. When you get back, you flip the switch back and become a normal person again.