On the morning of December 22, 1964, at a small, closely guarded airstrip in the desert town of Palmdale, California, Lockheed test pilot Bob Gilliland stepped into a strange-looking aircraft and roared into aviation history. Developed at the super-secret Skunk Works, the SR-71 Blackbird was a technological marvel. In fact, more than a half century later, the Mach 3-plus titanium wonder, designed by Clarence L. "Kelly" Johnson, remains the...