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if men and women were actually literal social equals (no women and children first shit) then they'd be fine
but in most western cultures, women are doted on in certain regards, specifically physical and emotional expectations
not to mention getting captured means likely rape or ransom. not that a male soldier wouldn't be ransomed, but I think they'd think about that one a little bit harder than paying to get a female back intact
for that matter there's a simple size and build disparity that makes women inferior to men in the single most important aspect of soldiering: carrying heavy shit for long distances on foot
now that doesn't mean they have no place in the military, however. I mean, back in WW2 they managed to train blacks to drive trucks without stealing them after all!