15th AF 52nd Fighter Group 5th Squadron A-2 jackets Brett Stolle-archivist Dayton ETO George J. Valentine Ohio P-51 Mustang Spittin Kitten Steve Teffenhardt The Saint USAF Museum WWII bomber jacket project book history insignia leather military Kit Galloway George Valentine P-51 pilot A-2 jacket National Museum of the United States Air Force national archives NMUSAF Wright Patterson Air Force Base