If women are to have the privileges of full citizenship then they should also have equal responsibilities. Anything less makes women second class citizens and lesser human beings.
“Petit” men who are drafted may well be rejected for simple lack of ability to do the job required, or assigned to duties which they are capable of doing. Likewise, women who are drafted would be assigned duties that fit their actual abilities. Due to biology you’ll have a lot fewer women qualifying for, example, infantry but it’s not like all men are capable of doing those jobs, either. You seem to presume the default state for men is “suitable for combat” but plenty aren’t. The military always has to screen draftees and weed out those unsuited. Heck, they have to do the same for volunteers as well.
I have long wondered why it is somehow more acceptable for a man to come back home in a box than a woman. Shouldn’t it be equally appalling for either gender? Aren’t they all equally human beings?