The Air Force is Involved
So, on top of being a top-secret research facility, the grounds also serve as a test area for the Air Force. Area 51 is isolated in the middle of the desert, which is the perfect place to test prototype aircraft. The Air Force has restricted 5,000 square miles of air space around Area 51 to test their top-secret planes, but some think that this is to prevent people from seeing into Area 51 itself.
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