DEFCON Levels History & List Of Alert Level Changes
History of official changes to the DEFCON level since the U.S started using the defense condition warning system. After NORAD's creation in 1957 the first DEFCON warning alert system in history was introduced.
In the beginning the defense condition system was more complex and had 3 readiness levels: normal, increased and maximum and were divided into 8 alert conditions that were later simplified.
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