In times of extreme hardship everyone must be willing to defend themselves and their offspring but a civilization which deliberately chooses as a matter of principle to not protect its child childbearing members is doomed to extinction.
In the first Gulf War, the alphabet soup networks broadcast a steady stream of single female service members trying to get out of going to the Middle East because of their younguns.
Bet all those who stayed in for 20 are drawing full retirement benefits now. Limited service, decided upon by the GI now; full benefits later. That’s feminist equality alright.
Make females register and, just like with the guys, make registration a condition for receiving federal benefits (student loans, etc.)