I missed the draft by a few years. But I was among the first to be required to register. This was in 1978.
20 years after that, when I had to fill out a form for a low level govt security clearance, I had to report the registration number. They even provided a phone number where you could call to get it.
I wonder how many idiots didn't register like they had to, and then find out the consequences of it decades later?