What is the threat? There is maternity leave and paternity leave in all the services.
You must have forgotten your gulf war history. Huge numbers of women "serving" on naval ships and in other military occupations, intentionally got pregnant so as to keep themselves out of harm's way.
Women shouldn't be in the service in any but support jobs. It is some Patricia Schroeder idiocy to ever let them in war fighting positions.
Just having women in combat positions is a detriment to the war fighting capabilities.