Thank you, @GeorgeCroner for publishing FOIA response!
1/ George Croner quote: "Now, Barr is incorrect about the need to register as almost anyone who was 18 in 1968, like Barr, will attest." i.e, all males must register on their 18th birthday (more)
archives.gov/foia/william-p…
The last 2 entries for Barr appear (to me) to be:
Jul 1971 => Status 1A
Jan 18 1972 => Status 1H (more...)
sss.gov/about/return-t…