Green stuff

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Across
  1. 3. Sign this to serve Queen and country
  2. 5. How you issue a fire control order (pneumonic)
  3. 7. Judging distances
  4. 9. When a message is received and understood
  5. 11. Anti tank weapon
  6. 12. You live under this
  7. 14. To be an effective soldier you must have this
  8. 17. A rank in the army
  9. 19. Holds ammunition
  10. 20. The bad person
  11. 21. When you come under attack you do this
Down
  1. 1. Services alphabet
  2. 2. Section battle drills (pneumonic)
  3. 4. Radio pro word for the commander
  4. 6. Ten rounds per minute rate of fire
  5. 8. Type of pistol
  6. 10. Fire control order (pneumonic)
  7. 13. One of the core values
  8. 14. A patrol formation
  9. 15. To describe a person or to camouflage
  10. 16. You need this to survive
  11. 18. Rounds per minute rapid fire