It has also been interpreted to mean:
2 US-citizen parents in service to their country living OFFCONUS at the time of the child’s birth.
Provided that child was born in an US facility such as Mil-hospital or in an embassy or mil-base.
But that interpretation has no solid foundation. I’ve read Freepers say on the 0b0la research threads that they were born overseas on a mil base to two citizen parents and were taught that they had every right any citizen born in the US has except the right to be president. It was written in State Department handouts at the time.