I was infantry (Army) back in the day before they started all this shit - the unit was a machine; designed that way. We had some smaller grunts that would cycle through that would have issue with some of the demand, but they were held to the standard. They will make standard or get cycled out somewhere else, most likely become a driver. And there's a career-defining stigma that comes it.
My first co-ed experience in the military was Airborne school. It was blended with other services too, so it was surreal the different standards. In my class of (maybe) 64, about 10 were female - all washed out withing the first five days. Weaker males that either couldn't keep up or reported injuries washed out in thr next two weeks. I think we graduated at a 50% wash rate. That was 20 some years ago. I wonder how fucked it is now