The YF-12 was developed in the 1960s as a high-altitude, Mach 3 interceptor to defend against supersonic bombers. Based on the A-12 reconnaissance aircraft, the YF-12A became the forerunner of the
Lockheed SR-71A > National Museum of the United States Air Force
National Museum of the U.S. Air Force - Can you guess the aircraft
Lockheed SR-71A
1 May 1965 This Day in Aviation
File:Lockheed YF-12A (2183418677).jpg - Wikipedia
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File:YF-12A NMUSAF.jpg - Wikipedia
Lockheed A-12, YF-12, SR-71 Blackbirds
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Lockheed D-21B > National Museum of the United States Air Force