Halo Lore (easy edition)

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Across
  1. 3. Installation that makes the Halo rings
  2. 4. The ___ is what the Covenant call activating the rings
  3. 5. Number of Halo Rings
  4. 6. Purpose of the Halo rings are to stop the ___
Down
  1. 1. Civilization that created the Halo rings
  2. 2. Sargent ______ Johnson
  3. 3. Name of the key that activates Halo rings