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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 A-12 - Wikiwand
Today in Aviation History: First Flight of The Lockheed YF-12A
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16 stunning images of the YF-12: A Mach 3 fighter jet of the 1960s
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Lockheed YF-12. A missile-armed interceptor version of the A-12
Lockheed YF-12A > National Museum of the United States Air Force
Today in Aviation History: First Flight of The Lockheed YF-12A
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Detailed tour around the Lockheed YF-12! The fighter version of
YF-12A This Day in Aviation
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Aircraft Photo of 60-6935 / 06935, Lockheed YF-12A
Lockheed YF-12A > National Museum of the United States Air Force™ > Display