Area 51 puzzle

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Across
  1. 2. An unidentified flying object
  2. 3. The dry, sandy landscape surrounding the base
  3. 5. The U.S state where Area 51 is located
Down
  1. 1. A person whose job is to keep trespassers away from the fence
  2. 4. Something kept hidden from the public
  3. 6. A being from another planet