Has the US ever been in Defcon 1?

Related questions

1. How do I become a traffic cop outside?
2. What Defcon is the United States at?
3. How does capture the flag work?
4. What is the current threat level?
5. How do you play Blob Tag?
6. What's freeze tag?
7. What is Defcon CTF?
8. What is Jeopardy style CTF?
9. What is Defcon short for?
10. What is a capture the flag event?

Tags

1. #status
2. #pistol
3. #condition
4. #neither
5. #department
6. #forces
7. #history
8. #level
9. #united
10. #white
11. #cocked
12. #alert
13. #defcon
14. #raised
15. #armed
16. #since
17. #defense
18. #levels
19. #states
20. #implemented