How many Virginia class submarines are there?

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Tags

1. #submarine
2. #cruise
3. #classes
4. #approximately
5. #firing
6. #class
7. #service
8. #tubes
9. #angeles
10. #launch
11. #commission
12. #equipped
13. #backbone
14. #those
15. #system
16. #force
17. #submarines
18. #missiles
19. #thirty
20. #three
21. #vertical
22. #tomahawk