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Lockheed YF-12 🇺🇸It was an interceptor aircraft prototype developed by American company Lockheed for the U.S. Air Force.The YF-12A tests achieved new speed and altitude markings and demonstrated promising results with its weapon system. Six AIM-47 missiles were launched, the last from a YF-12 to Mach 3.2 at an altitude of 22,677 meters to a target, an unmanned B-47 152 meters from the ground. In 1965, the Air Force ordered a 93 F-12B, but it was cancelled.4 prototypes were manufactured.