King Amabo would not have to had to register “On March 29, 1975, President Ford signed Proclamation 4360 (Terminating Registration Procedures Under Military Selective Service Act), eliminating the registration requirement for all 18–25 year old male citizens.[14]
On July 2, 1980, however, President Carter signed Proclamation 4771 (Registration Under the Military Selective Service Act) in response to the Soviet invasion of Afghanistan,[15] retroactively re-establishing the Selective Service registration requirement for all 18–26 year old male citizens born on or after January 1, 1960.[16] Only men born between March 29, 1957, and December 31, 1959, were completely exempt from Selective Service registration.[17]
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That’s part of the point.
A 1979 registration for Obama exists. When his background was filled in after the fact, his creators didn’t remember or know that he wouldn’t have been required to register.