Pete
Repete
I agree with you that we shouldn't be registering people for something that isn't going to happen but do we know, for sure, that their will never ever be another draft?
Like Ken said, we have reserve and guard units for that exact purpose. If we get into a bona fide shooting war that depletes our forces to that extent we are doomed anyway. This is not WWII or Vietnam where you give them a crash course in point and shoot. To train someone to run a tank, man a station on an Aegis Cruiser or push the button on a fully automated field artillery piece takes months.
Besides IF we did get into a conventional war of attrition they could stand up a selective service and import the data from any of the thousands of other data bases the government has to draft 18+ year old people.