The NATO alphabet

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Across
  1. 2. Form of electromagnetic radiation (4)
  2. 4. Ethnic group of Southern Africa (4)
  3. 6. Short form of microphone (4)
  4. 8. First letter of the Greek alphabet (5)
  5. 9. The Academy Award (5)
  6. 11. What you wear to school (7)
  7. 13. Landform at the mouth of a river (5)
  8. 15. Winner (6)
  9. 16. Reflection of sound (4)
  10. 20. Prefix meaning a thousand (4)
  11. 23. Well done ! (5)
  12. 24. ------- Chaplin, English actor, comedian and filmmaker (7)
  13. 25. Largest province of Canada (6)
  14. 26. ------ Doodle went to town riding on a pony (6)
Down
  1. 1. Our country (5)
  2. 3. Alfa -----, Italian maker of cars (5)
  3. 5. Capital of Peru (4)
  4. 7. It takes two to ----- (5)
  5. 10. Romeo and ------ (6)
  6. 12. The penultimate month of the year (8)
  7. 14. Dance similar to Waltz (7)
  8. 17. e.g. Marriott, Oberoi, Leela etc
  9. 18. Another word for daddy (4)
  10. 19. Club and ball game played on a course (4)
  11. 21. ------ Nevada, mountain range in U.S and Spain (6)
  12. 22. Spirit distilled from a mash of fermented grains (7)