The United States Defense Ready Condition (DEFCON) system indicates “situations of varying military severity (status of alert),” according to the U.S. Department of Defense : r/coolguides
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Let's Play WarGames Defcon 1 #01 [NORAD][Deutsch][HD] - Commander Ari ist zur Stelle - YouTube
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DEFCON-2: Standing on the Brink of Nuclear War During the Cuban Missile Crisis (English Edition) eBook : Polmar, Norman, Tom Clancy: Amazon.de: Kindle-Shop