The U-2 Spy Plane is a confirmed Area 51 project. Lockheed worked with the CIA to develop a plane that could fly at a high altitude and spy on other nations. The U-2 could fly at altitudes of 70,000 feet and was effective in reconnaissance missions for several years. During the development of the U-2, the CIA and Lockheed realized they would soon need more advanced aircraft because the Soviet Union's missile technology was rapidly catching up. In 1960, the USSR shot down a U-2, confirming this concern.
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