A small Lightning digression here, but I remember one USAF exchangee who did RTB Stateside but only after he had dumped 2 of 5 Sqn's jets in the North Sea.
Back on track, the CF-104 apparently had an INS that was so inaccurate as the distance-to-go approached zero that the pilots used to add 100nm to each leg, fly in on the correct track and then turn at 100nm.