My solution for that is one that probably treads a very fine line when it comes to "reproductive rights." Take the females in for a reproductive briefing, or series of briefings. Break it down, in no uncertain terms, what the damage to unit cohesion/esprit de corps/blah blah blah would be if they got knocked up. shoot them straight about the science in the process of getting pregnant so as to dispel any bullshit old wives' tales, and then allow for everyone to choose their contraception (condoms and the rhythm method do not count). To make it more palatable, it could be presented as a means to reduce/eliminate menses during the training cycle, not just to make sure Pvt. Whorebag doesn't piss hot for hCG.
Obviously, it would have to be non-permanent, as any of the permanent sterilization methods would require a week of con leave at minimum (in the case of Essure), and much longer for tubal ligation, and that's not even addressing the ethical complaints about same.
Once all that is out of the way, if PVT Sugartits still gets pregnant, then it's time to run her high up the captain's mast. Like I said earlier, my solution has some ethical issues, but that's how I would address that problem.
