You keep including the words 'a foreign national'. If you are born of American parents, on American terrority, you are considered a 'natural-born citizen'.
Besides, if you want to argue that an American Military Base in a foreign nation is not American Territory, you will have to talk to the U.S. Post Office.
Along with the U.S. Senate, the House of Representatives, statutory law, the Supreme Court and the U.S. Constitution.
Technically, an American base overseas is not American territory -- like the U.S. embassy -- but it insures the legitimate American citizenship of any child borne of American parents on that base (or under its auspices).
To argue otherwise is to be wrong.
Actually according to law if you're are born of American parents in the middle of Red Square you're a natural-born citizen.
Besides, if you want to argue that an American Military Base in a foreign nation is not American Territory, you will have to talk to the U.S. Post Office.
OK I'll bite. What does the post office have to do with it?