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Pragmatically, the main weapon in most wars were arrows and swords.

Pragmatically, most of the military is far from the battlefield - or the battlefield is on home territory, in which case everyone is involved anyway, so train 'em all and let the Night Witches fly, as the Soviets did when they needed more fighting forces against the Germans. "Some 400,000 women fought for the Red Army on the front lines"[1], and were not saved for later potential reproductive use.

Pragmatically, women are much more more than a baby gestation machines.

Since you have no problems with sterile women (tubes tied, no uterus, etc.) in the military, there's really no need to jump into a thread about rejecting ALL women from the military based on hand group strength.

[1] https://hilo.hawaii.edu/campuscenter/hohonu/volumes/document... linked from https://en.wikipedia.org/wiki/Marina_Raskova .

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However, with birth rates plummeting -- is this even true any more?
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Import migrants. This is the solution to demographics that most countries found. (not my favorite though)
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It seems like it would be even more true when birth rates are falling
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