Who is second in command of the US military?

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Tags

1. #homeland
2. #secretary
3. #under
4. #exception
5. #defense
6. #president
7. #security
8. #related
9. #matters
10. #below
11. #guard
12. #coast
13. #serves
14. #assistant
15. #chain
16. #principal
17. #second
18. #armed
19. #which
20. #command
21. #forces