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The performance figures of the A-12 (predecessor to the SR-71) have only recently been declassified. The A-12 flew faster and higher, Mach 3.29 at 90,000 feet, than any other piloted operational jet aircraft, including the SR-71. Numerous efforts were made by the North Vietnamese to shoot down the A-12, all without success, hence the namesake of this painting: "Untouchable."