Should they be allowed to? Sure, it's their right too. Should they? Hell no. Would it be good if they did? No, it'd probably be worse.

And actually, they aren't allowed to now. They can be in combat zones, but they can't technically be in a combat MOS--a job specifically trained, and expecting, to face combat. Combat Engineers, Infantry, Artillery...no women. They can, however, be Military Police, which in Iraq are doing many Infantry jobs, or things like Medics, which are attached to Combat Engineers/Infantry/etc.

Now, you show me a woman that can carry as much as a male soldier for as far as a male soldier can carry it, can shoot as well as a male soldier, can obey commands without hesitation and do everything else the male soldiers have to do in "usual" combat situations, and I'll welcome her in. But while the PT standards stay so low for females, no way.