For DEFCON we have terms and definitions in 2 topics. The topics are Cold War and Vietnam War.

System of defense conditions used by the U.S. military, ranging from DEFCON 5, the lowest state of alert, to DEFCON 1, indicating war.
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Defense Readiness Condition. A uniform system of progressive alert postures for use between the Joint Chiefs of Staff and the commanders of U.S. commands and for use by the Services. Defense Readiness Conditions are graduated to match situations of varying military severity (status of alert). Defense Readiness Conditions are identified by the short title DEFCON (5), (4), (3), (2), and (1), as appropriate. (with DEFCON 1 being the highest readiness level and DEFCON 5, the lowest).
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