What is definitely known about Area 51 is that it's used by the US government to develop and test experimental aircraft and weapons systems and that it's been doing this since flight-testing of the U-2 spy plane began there in 1955. Designed by Lockheed, on behalf of the CIA, the U-2 was a high-altitude, long-range aircraft capable of flying over enemy territory and taking pictures, unobserved. The site is bordered to the west by the Nevada test site - a vast tract of desert sequestered by the Department of Energy, ... very much off-limits to the public. Area 51 was the perfect place to develop and test the black projects" - military aircraft so vital to America's national security that even most members of the government had no "need to know" that they even existed. West of the base's main living quarters, on a piece of ground slightly above the lake bed, a waste dump had been constructed. Vehicles with California license plates would head up to the dump to unload cargoes of waste too secret to dispose of normally. While a lot of waste material put into the pits was generated on-site, there were also the contents of those trucks that hauled up every week from California.