As a foreigner in the RAF, I can only tell you that it is not absolutely necessary to have a Brit Passport, but would help a shtiload. Eg. We non-poms can't view double vetted material (eg. UK/US eyes only) without a special dispensation from the US for every viewing. Great. As for the "fast-track" system....Believe it when I see it. For 18 months the RAF has been telling us we're getting a passport, ain't seen one yet.Fast-track smasht-track.At the mo we have to wait the 3-5 years to make sure we are of sound character! "Here is a jet, here are some weapons, but sorry you can't have a passport". Go figure