Why does Bravo Zulu mean good job?

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Tags

1. #origins
2. #simply
3. #members
4. #north
5. #english
6. #allied
7. #means
8. #naval
9. #treaty
10. #originally
11. #semaphore
12. #atlantic
13. #bravo
14. #which
15. #signal
16. #flags
17. #organization
18. #decades
19. #created