This has been a dirty little secret for a long time, and it gets even worse as time goes on. Women who are in more physical fields break down at even higher rates as they enter their late 20's. There was a female Marine captain awhile back who wrote an extensive article about what long conditioning hikes carrying lots of gear did to her over time, and she said that was really common among female Marines. So even if they make it through boot camp uninured, most end up being on light duty or worse if they are in physically demanding fields. But...gender equality and all that says we must keep doing it even if it kills readiness.