Back in the Vietnam Draft era all of us who were the right age, sex etc. had to carry our draft cards (at least, the one I still have, from ca. 1972, explicitly states that I must always carry it, no expiration date that I can discern - which is not actually why I still have it ;-). On the other hand, I was brought up to believe that internal passports were one of the several reasons we were better than the Russians, i.e. they had them, we didn't.

Liland