It was passed into law that you had to register for the draft in 1978
Correct. There was a two year window for people who turned 18 in ‘76 and ‘78 where you didn’t register, they weren’t even doing registrations.
Anyone born in 1960 or greater had to register after turning 18. I registered that first month in 1980, just five days prior to what Soebarkah’s documents are dated.
I called SSS and got my print out ordered and will share that when it comes. I may have to issue an FOIA to get the original document that I signed. It's on Microfilm.