Just like Alison Tieman when I was as a teenager and first read the German constitution I too noted the the gender in-balance of the article 12 in constitution which describes the Wehrpflicht as the draft is called in Germany.
While the German constitution does actually allow to draft women into non combat (aka nursing) roles in a case of uppermost emergency that never actually happened.
While I have been actually been drafted into the military for 15 month without any emergency at all.
So I'm very much look forward how this will go. And since, for better and worse, the US has example role how other countries how other countries will react to this.
Women must register for Selective service or it's unconstitutional. The National Coalition for Men has won it's lawsuit challenging the unconstitutionality of male-only selective service registration.