Basically, women are perfectly capable of fighting--as long as it doesn't involve extended operations in the field requiring physical strength to move and carry a lot of stuff (or wounded troops), which men--on average--are far better at performing and surviving.
The bottom line?
In the last century there have been several attempts to use women in ground combat units, and all have failed. When given a choice, far fewer women will choose combat jobs (infantry, armor, artillery). But duty as MPs does attract a lot of women, as do jobs like fighter, bomber, helicopter pilots and crews, and aboard warships. That works.
Read it all, as they say.