Pigeon Impossible

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Across
  1. 3. a spy acting for a country.
  2. 4. a business or organization providing a particular service on behalf of another business, person, or group.
  3. 6. a weapon that is self-propelled or directed by remote control, carrying conventional or nuclear explosive.
Down
  1. 1. a leather or plastic rectangular container with a handle for carrying books and documents.
  2. 2. a cylindrical projectile that can be propelled to a great height or distance by the combustion of its contents, used typically as a firework or signal.
  3. 5. Central Intelligence Agency