Trashman, the concept of a 'barrier test' is foreign to you, is it not? If a woman should be able to exhibit the mental and physical toughness necessary for admission to a Special Forces training program (as well as the other obvious necessaries), then why the hell not?
Fair enough, men may be able to outperform girls, but if that girl can meet the standard, and pass Special Forces training, then by all means, she should be allowed to join. Rather than saying "no, you cannot meet the standard." Opening it up for women to try, is fine and harms no-one.
If you screen every woman on Earth, of course you're going to find that the majority are unsuitable for combat, but you may also find a minority are able to go the hard yards under fire and hack being in a spec ops unit. I'm all for letting that minority at it.