Even though the arguments of, "this is how it should be" sound great, they are poor arguments because it assumes that everyone will act civil and proper. Sure, cats and dogs should get along, but you're more likely to see a cat in a tree with a dog barking at its base.
Did you know that there are a good number of women getting Article 15'd and shipped back because they were getting pregnant in Iraq? Did you know that some of them did it on purpose because they wanted to go home? Well now that you do maybe you can add another mark on the 'Don't mix men and women' board. Yeah, guys should control their dicks, but when a woman wants to go home and is trying to get pregnant to do so, that put's a whole lot of strain on her male counterparts.
And on the subject of the general sexual tension: There was a Bradley crew that had a female medic with them. One of the crew liked the girl(first problem) and she shot him down(second problem). Now they hate each other(third problem) and will get into literal slap fights during potential combat situations(fourth problem). Now you can say whatever you want about self-control and maturity, but the simple fact is that if those two weren't put together in the first place then there would not have been a problem at all.
I'm not saying that women shouldn't be allowed into the army because they aren't the problem. The problem is how men and women interact. If you want to fix the problem, you have to fix the issues, and personally, I think the best way to do that is by separating the sexes. Or by taking one of them out of the military completely(men or women, it doesn't matter. They can both do the job, just not together).
Of course, that still leaves the other problem of people on the outside looking in, trying to come up with solutions to problems that they have no clue about. When the news is your best source on anything, just try to remember that you still have no clue what is going on. They'll just feed you the best lines to generate viewers and revenue, which is why you never hear a good story about the war. 'In today's news, nothing really happened in Iraq. Some soldiers encountered and Iraqi group, they were all friendly, and they even shared a meal together' doesn't sell. So remember, whatever you've been fed is not straight from the horse's mouth(ie from the original source), but from that horse's second cousin's mother-in-law, and you know how much that woman likes to gossip.