NATO Brevity Codes (Hard)

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Across
  1. 2. Ships of a surface attack unit
  2. 4. Explosive Echo ranging
  3. 5. In air/sub coord., prefix used to pass homing info to acft
  4. 7. EMCON plan is modified as follows...
  5. 9. Electronic jamming
  6. 11. A towed sonar array system which is towed by surface ships or subs
  7. 13. Sighting of target, bandit, etc
  8. 14. Activate daily changing callsigns for current period
  9. 15. Friendly aircraft whose callsign is unknown
  10. 17. Directional active sonobuoy
  11. 20. Change of operational control
  12. 21. Ships of a surface attack group
  13. 22. Authentication policy in force
  14. 23. Ship-borne FC radar
  15. 25. Emitter has stopped radiating
  16. 26. Report characteristics of an intercepted signal
  17. 28. Reporting responsibility
Down
  1. 1. I have been unsuccessful
  2. 2. ASW weapon state report
  3. 3. Sub patrol area in barrier
  4. 6. Continue using daily changing callsigns currently in use until further notice
  5. 8. Underwater telephone equipment
  6. 10. Friendly aircraft
  7. 12. I am unable to operate (emitter) for reasons of national security
  8. 15. Execute EMCON in accordance with EMCON policy
  9. 16. Non-directional sonobuoy
  10. 18. Anti surface ship missile state report
  11. 19. ASW helicopter capable of sonar searching and attack
  12. 24. Active ship borne sonar
  13. 27. Friendly surface vessel whose callsign is unknown