Blackbird (OXCART / A-10 / A-11 / A-12 / SR-71) program :
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 later known as the 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 also 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 were subject to "lethal force"). Groom saw the first flight of all major Blackbird variants: A-10, A-11, A-12, RS-71 (renamed SR-71 by USAF Chief of Staff Curtis LeMay and not by a presidential error as popularly believed), the abortive YF-12A strike-fighter variant, and the disastrous D-21 Blackbird-based drone project.

Have Blue / F-117 program ::
The first Have Blue prototype stealth fighter (a smaller cousin of the F-117) first flew at Groom in late 1977. Testing of a series of ultra-secret prototypes continued there until mid-1981, when testing transitioned to the initial production of F-117 Nighthawk stealth fighters. In addition to flight testing, Groom performed radar profiling, F-117 weapons testing, and was the location for training of the first group of frontline USAF F-117 pilots. Subsequently active-service F-117 operations (still highly classified) moved to the nearby Tonopah Test Range, and finally to Holloman Air Force Base.