Ah, invasive extra paperwork (enforced by criminal penalties, at least in theory) for something they say on the surface they won’t actually need. So very german (hah)
I suppose it's only a boring piece of extra paperwork until at some moment the permit stops being automatically issued.
They dont need now. Germany is getting ready for being invaded by Russia, basically. They are also building mandatory military service.
In the United States, adult males have to sign up for the Selective Service for the same reason even though we haven't had conscription since the Vietnam War in the late 1970s(?).
https://en.wikipedia.org/wiki/Selective_Service_System