That’s his dissertation at New Brunswick, from his research in support of his PhD. He was also awarded multiple masters levels degrees, one of which was from early in his career when he was still an intelligence officer. That school - now under the Office of the Director of National Intelligence - was at the time under the Defense Intelligence Agency. I haven’t seen a reference to his research at that time - which I suppose might have been different, given that he had not left Air Force intelligence to be tract into the historian / professor niche field yet.