Didn’t know that (my globe-trotting days were well after the 1960’s :-}). O was in Indonesia from sometime in 1967 to sometime in 1972. Since he was only 5 or 6 when they left the U.S. and he was young enough to be on Mom’s passport, maybe they got back before it had to be renewed at which time he would have been too old to be on hers and would have been required to apply for his own.
Well, he came back to Hawaii when he was about 10. I took my younger son to England when he was that same age because he was just out of a cast from a broken leg and I did not trust him to be in the care of his older siblings. I did not want ANY rough housing while his leg muscles, which had been confined in a cast for several weeks, strengthened. He is 4 years younger than Obama and this was around 1978. He had his own Passport. I still have it — expired, of course.