Obama told George Stephanopoulos yesterday that he regsitered for Selective Service when he graduated from high school in 1979, and implied that it was at that point he considered joining the military.
Obama may well have registered for Selective Service, but he didn’t do it in 1979. From Wikipedia:
On March 25, 1975, Pres. Gerald Ford signed Proclamation 4360, Terminating Registration Procedures Under Military Selective Service Act, eliminating the registration requirement for all 18-25 year old male citizens. Then on July 2, 1980, President Jimmy Carter signed Proclamation 4771, Registration Under the Military Selective Service Act, retroactively re-establishing the Selective Service registration requirement for all 18-26 year old male citizens born on or after January 1, 1960. Only men born between March 29, 1957, and December 31, 1959, were completely exempt from Selective Service registration. The first registrations after Proclamation 4771 took place on Monday, July 21, 1980, for those men born in January, February and March 1960 at U.S. Post Offices. Tuesdays, Wednesdays and Thursdays were reserved for men born in the later quarters of the year, and registration for men born in 1961 began the following week .