21a

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Across
  1. 3. Mounted troops
  2. 5. Combat builders
  3. 10. Air superiority
  4. 11. Airborne soldiers
  5. 16. Foot soldiers
  6. 17. Naval special ops
  7. 18. Battlefield healers
  8. 19. Marksmen
Down
  1. 1. Maritime security
  2. 2. Elite army unit
  3. 4. Scouts
  4. 6. Underwater navy
  5. 7. Amphibious troops
  6. 8. Armored division
  7. 9. Heavy firepower
  8. 12. Ground force
  9. 13. Aircraft operators
  10. 14. Supply management
  11. 15. Special forces
  12. 20. Sea force