> was something dismantled after vietnam?
Yes, the law authorizing the draft expired in June 1973, after a strategy was developed and a policy decision made to pursue it to meet military needs without conscription.
Enforcement of the registration requirement that expired in the 1970s but was reactivated in 1980 without any actual draft law was discontinued by agreement between Selective Service and DoJ in 1988, but no actual prosecutions were pursued after 1986, and compliance has always been low (even with the stick of student loans, which gets lots of people heading to college registered, those who register are unlikely to update address when they move while registered.)
So: we no longer (for 45 years) have a law authorizing conscription.
We no longer (for 30 years) even pretend to have enforcement of the law requiring registration in case we decide we need conscription and pass a law authorizing it.
And we no longer (for more than the 30 years of non-enforcement, really, but even moreso after that) have much compliance with the law requiring registration in case we decide we need conscription and pass a law authorizing it.
Everything that happens around Selective Service registration requirements absent changes in all that is purely symbolic ritual with no real substance.