Why does the Vatican have Swiss Army?

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Tags

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2. #guards
3. #armed
4. #clement
5. #significant
6. #empire
7. #vatican
8. #force
9. #during
10. #passageway
11. #guard
12. #troops
13. #allowing
14. #complemented
15. #engagement
16. #swiss
17. #fighting
18. #corps
19. #through
20. #safety
21. #military
22. #stone