Lockheed A-12: The CIA’s Blackbird and Other Variants by Paul F. Crickmore, Osprey Publishing, Oxford, England, 2014 The shooting down of Francis Gary Powers’ Lockheed U-2 by SA-2 surface-to-air missiles at 70,500 feet showed that high altitude alone could not be a defense for American spy planes. Clarence L. “Kelly” Johnson and Lockheed’s “Skunk Works” …
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