EDIT: This is getting a bit out of hand. I would like to focus on women in video games. Not IRL. After doing some basic research (which I should have done early). I've learned many, often quite simple and basic, reasons why women aren't generally ideal for combat applications in real world situations. However, I still feel it's a bit of a stretch to exclude women from combat roles in realistic games because of these real world limitations.
Aww, while reading your entire post I prepared myself to crush your dreams about the role of female gender on a battlefield. If you are looking for not-oversexualized fighting women, try Call of Duty 2. If I remember the soviet campaign correctly, there were female conscripts, but rather among lower ranks, yet still you hear them shout warnings and stuff. Speaking of which, I'm not sure if anyone mentioned this, but russians during II World War had entire brigades consisting entirely of conscripted women. (now how to avoid being sexist) This concept got discontinued, as female units were, (how to politely say it) "less reliable" than their regular, male counterparts in battlefield conditions. Men were also considered more disposable then women.
also OT:
I like women, quite a lot. And if one were on the battlefield next to me in say.... Modern Warfare 2, I'd work my ass of to ensure she makes it to the other side of an ambush
Holy Ravioli. If it were Team Fortress 2, I'd have your ass banned from the server instantly. I absolutely fucking hate pocket-white-knight-medics that spawn almost instantly once any player reveal itself as a girl.
EDIT: By the way, it's quite sexist to think that battlefield-capable woman would actually NEED your help, isn't it OP?