Eglin A.F. Base Air Proving Ground Portfolio. 1950. Bound portfolio prepared for the Joint Orientation Conference, April, 1950. With photo of typed mission description, accompanied by photographs of President Truman and the Air Force leadership, accompanied by seventeen 8 x 10â€ photographs of various bombers, including B-36, B-29, B-17, B-26, B-47, as well as fighter jets, including F-84â€™s, F-51, F90, F-94, JB-2 Jet Bombs, â€œRocket missionâ€ sequence of four photos, and others.