According to Air & Space/Smithsonian, as of 2022, the U.S. DEFCON level has never been more severe than DEFCON 3.
https://en.wikipedia.org/wiki/DEFCON
According to Air & Space/Smithsonian, as of 2022, the U.S. DEFCON level has never been more severe than DEFCON 3.
https://en.wikipedia.org/wiki/DEFCON