Generally, women don’t have the killer instinct that men do. Like every rule, there are exceptions, but more often they are a liability on an actual battlefield when competing with men.
They are also a distraction when they get injured, because it is instinctual for men to momentarily lay down their arms to take care of an injured woman.
Even if only for seconds, it’s an deadly delay.
50 guys for every woman. Not bad odds. “An Officer And A Gentleman” in Michners Tales of Paradise was a good story. She was not attractive. He was lonely. She was lucky to hook up with an officer even if he was married. Speaking of that enlisted women were allowed to go to the officers club on my base. Guess they were invited.
Most of the jobs in the military are not front-line combat positions. They're support positions. Keeping the ammo ordered, the spare parts coming, the equipment working, the paychecks and benefits to family members accurate. Mending broken bodies.
In the aviation field, I will say that some of the best air framers I've ever worked with have been women. Some of the best jet engine mechanics I've known have been women. I know fighter pilots who ask for these women specifically by name when they need their airplane fixed.
And here's another thing to chew on. Having a women in the rear taking care of supply and paychecks frees up a man for the front lines and women have been doing these roles since the Civil War.