October 13, 1972 Posted on October 13, 2020October 8, 2020UDORN AIR BASE, Thailand — U.S. Air Force ace, Capt. Jeffrey Feinstein, 13th Tactical Fighter Squadron, poses beside his F-4 aircraft. (Photo by Ken Hackman) 1972: MACKAY TROPHY. F-4 weapon system officer Capt Jeffrey S. Feinstein shoots down his fifth MiG-21 to become the third and final USAF ace of the Vietnam War. Posted in History.