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DEFCON is an acronym in English of Defense Readiness Condition or Defense Condition which is a State of alert or defense used by the armed forces of the United States. It is used to measure the level of availability and the defense of the American army to a threat. There are 5 levels of DEFCON that are used depending on the seriousness of the situation. DEFCON 5 is active in times of peace and the number will decrease as the situation becomes more critical. DEFCON 3 involves an increase in the availability of forces above normal. The US military has reached this level three times. (1) in 1962 during the Cuban missile crisis. ((2) in 1973 during the Yom Kippur war and 3) in 2001 during the September 11 attacks on the twin towers of the World Trade Center in New York. DEFCON 1 is the level of high alert that has never been used.