A uniform system of progressive alert postures for use between the Chairman of the Joint Chiefs of Staff and the commanders of unified and specified 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. Also called DEFCON.
DEFENSE READINESS CONDITION
Meaning of DEFENSE READINESS CONDITION in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012