Why do fighter pilots wear masks?

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Tags

1. #could
2. #where
3. #answer
4. #masks
5. #oxygen
6. #would
7. #pilots
8. #avoid
9. #communications
10. #their
11. #mixture
12. #fresh
13. #fighter
14. #until
15. #besides
16. #landing
17. #symptoms
18. #without
19. #provides
20. #inside
21. #hypoxia
22. #passengers
23. #emergency
24. #microphone