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Lockheed YF-
The Lockheed YF-12 was a top-secret aircraft developed during the Cold War for reconnaissance missions. It was designed to be the fastest and most advanced military jet in the world, capable of reaching speeds of Mach 3.2. The aircraft was a result of a collaboration between Lockheed and the U.S. Air Force, and was built to replace the aging SR-71 Blackbird.