More than likely an A-2 as it was for official government work. It's actually a quite common scenario, not odd at all....we train a ton of military officers from foreign nations, particularly for general leadership courses and highly technical courses that are resource heavy, like pilots. When I was in the marines, I went through training with Saudis, Kuwaitis, Turkish, Colombians, Belizians, Ghanaians, Liberians, Zambian, Filipino, and to a lesser extent South Koreans, Taiwanese, French, and so on.
See prior posts about why he wasn't a prohibited person.