The numbers say that the top quarter can match the lowest quarter and participate and so they should. A rarity will make it into a higher standard. But so what? soldiers die first from their mistakes and simple bad luck and last from been over matched mano a mano.
That said, all this is easily explained by the simple by simple muscle mass differences and not by skill and instincts. So let us leave it at that and allow women to be combatants. However, i would insist that we form all female combat teams as well and quite the mixing game. Combat ensures closeness and sexual distraction all of which lowers combat alertness.
i do not know about women but men are hard wired to lose their edge or battle rage the moment they eyeball a set of breasts. Try it out when you are angry with your other half. It is laughable. No discipline can affect that biological response. Thus close contact in a combat situation is naturally dangerous even if one is aware of the phenomena..