Was that with his middle initials? The LG usually puts them in, which is what made me shy away from being certain that it was him; however, since I've now looked at a couple of online editions of the Air Force List and can find a D Fulton but not a DAA Fulton, this either means that recollection that he was a P/O was wrong and he was an NCO (which seems an unlikely mis-remembering by relatives given all the other detail known) or that the middle initials weren't used in the listing. I can think of a couple of other instances I've run into where, on joining up, the individual concerned chose not to give their initials, in the same sort of way that Harry S Truman declared that his middle initial stood for 'S'...