In 1957, with the arms race in full swing, the Department of Defense had decided it was just a matter of time before an airplane transporting an atomic bomb would crash on American soil, unleashing a radioactive disaster the likes of which the world had never seen. This dirty bomb menace posed a growing threat to the internal security of the country, one the Pentagon wanted to make less severe by testing the nightmare scenario first. The organization needed to do this in a controlled environment, away from the urban masses, in total secrecy. No one outside the project, absolutely no one, could know.

Officials from the Armed Forces Special Weapons Project decided that the perfect place to do this was at Area 51.

Source: DailyBeast.com

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