What does the D on D Day stand for?

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Tags

1. #stands
2. #forces
3. #executed
4. #along
5. #describe
6. #those
7. #commonly
8. #designated
9. #world
10. #widely
11. #allied
12. #during
13. #something
14. #lines
15. #invade
16. #decision
17. #believed
18. #france
19. #operation
20. #called
21. #overlord