Blackbird Programs

Even before U-2 development was complete, Lockheed began work on its successor, the CIA's OXCART project, a Mach-3 high altitude reconnaissance aircraft, a later variant of which became the famed USAF SR-71 Blackbird.

The Blackbird's flight characteristics and maintenance requirements forced a massive expansion of facilities and runways at Groom Lake. By the time the first A-12 Blackbird prototype flew at Groom in 1962, the main runway had been lengthened to 8500 ft (2600 m), and the base boasted a complement of over 1000 personnel. It had fueling tanks, a control tower, and a baseball diamond. Security was greatly enhanced, the small civilian mine in the Groom basin was closed, and the area surrounding the valley was made an exclusive military preserve (where interlopers could be subject to "lethal force"). Groom saw the first flight of all major Blackbird variants: A-12, SR-71, its abortive YF-12 interceptor variant, and the D-21 Blackbird-based drone project. The A-12 would remain at Groom Lake until 1968.