Learning to Spy

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Across
  1. 2. / A false passport or visa
  2. 4. / Branch of US Defense Dept responsible for ensuring security of American communications
  3. 6. / Official name Britain's MI5
  4. 7. / Spy operating without cover or backup
  5. 10. Trap / Use of men or women to ensnare or intimidate
  6. 12. / OSS & SOE term for teams dropped into Europe before D Day to help resistance groups
  7. 18. / Post where espionage conducted
  8. 19. / System for disguising messages using and shuffling letters and numbers
  9. 20. Drop / Secret location for materials to be left for another agent
  10. 21. / Person unofficially employed by intelligence service gathering information
Down
  1. 1. / Us foreign intelligence service
  2. 3. / Cipher machine used by Germans to encode messages in WW11
  3. 5. / Term used by British intelligence for a spy
  4. 8. / When a case officer or agent is compromised
  5. 9. / Agent sent to penetrate another opposing agency
  6. 11. / A clandestine radio
  7. 13. / Codename for intelligence from derived decrypted messages from German encryption machine
  8. 14. / Agent who searches obituaries and graveyards for names of dead to be used for agents
  9. 15. / Britain's WW11 sabotage and subversion agency
  10. 16. / Case officer responsible for agents in operation
  11. 17. / Headquarters of any espionage service