It means that we are going to war. (I learned that from a movie, War Games)
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The Strategic Air Command (SAC) was placed on DEFCON 2. Other elements of the US Military remained at DEFCON 3. DEFCON 1 has never been used.
FROM: ottawa1234 DECON stand for: DEFence CONdition. When a nations feels threatened possibly by a war, they would lower the DEFCON to 1, meaning increased military readiness incase of wars. And DEFCOM 5 is normal peace-time readiness, anything in beetween should be pretty clear.
We moved to Defcon 2 because relations with Fidel Castro were becoming complicated. After the failure of The Bay of Pigs Invasion Castro became Afraid of the U.S invading the island of Cuba. He considered launching all nuclear war heads that would be defined as MAD (Mutually Assured Destruction).
The United states has only been at def con 2 once. This was during the Cuban Missile Crisis. Some believe that we went to def con 2 during 9/11.
At the time that U.S. military forces worldwide go to DEFCON 3 and encourage all NATO forces to do the same. Supreme NATO Commander Norstad, however, refuses to do so. General Norstad was scheduled to relinquish his NATO command on Nov. 1, 1962, but the Cuban missile crisis that October prompted NATO to ask him to stay in the post until early in 1963. As the crisis deepened, the U.S. went to DEFCON 2 for the first time in history. On October 28, 1962, the United States sends instructions to its NATO allies that military actions to attack Cuba are imminent. At the height of nuclear brinkmanship between the U.S. and the U.S.S.R., Kennedy agrees to dedicate part of his nuclear arsenal to NATO. Khrushchev the same day broadcasts on Radio Moscow, effectively ends the missile crisis.