Women in combat:
the problem comes with the basic tenants of western chivalry. if a woman on the front lines is captured, it is acknowledged by many cultures she will not be allowed the sanctions of the Geneva Convention and will be treated as "spoils of war". the men in her unit are likely to attempt rescue even if doomed to failure. that equates to additional, unnecessary loss of life/objective. read about the female pilot captured in the early sandbox episodes.