I think Stan found the right information - the letter from a General Officer, in particular. I recall attempting to get a Visa for one of our translators in 2007. I'm not sure who found the rules - I think they were similar to the ones that Stan found - but among the rules was a letter from a GO. We got it. Unfortunately, I'm not sure if we crossed all of our T's and dotted all of our I's. The translator was killed by a suicide bomber before we could process the paperwork. If there is any silver lining, all of the documentation of his credentials made it easier to obtain $10,000 for his widow.