While he was in the Air Force he spent some time in places like Saudi Arabia and Iran. I don't know if he made any lasting Muslim friends from those places but he may well have. No he resides outside the US.
Does he have trouble going through airports? I don't know if he does or not. This guy, with a very similar background, sure does.
Since my Uncle looks more like a 70 year old blonde-haired, blue eyed version of Ricky Nelson than he does some swarthy middle eastern bomb thrower I suspect he doesn't have a problem.