Alert posture used by the United States Armed Forces
For other uses, see Defcon (disambiguation).
DEFCON levels
The defense readiness condition (DEFCON) is an alert state used by the United States Armed Forces.[1][2] For security reasons, the US military does not announce a DEFCON level to the public.[1]
The DEFCON system was developed by the Joint Chiefs of Staff (JCS) and unified and specified combatant commands.[3] It prescribes five graduated levels of readiness (or states of alert) for the U.S. military. It increases in severity from DEFCON 5 (least severe) to DEFCON 1 (most severe) to match varying military situations, with DEFCON 1 signaling the impending outbreak of nuclear warfare.[1][2]
DEFCONs are a subsystem of a series of "Alert Conditions", or LERTCONs, which also include Emergency Conditions (EMERGCONs).[4]
^ abcTiffini Theisen (2023). "What is DEFCON?". Military.com. Retrieved 19 November 2023.
^ ab"Department of Defense Dictionary of Military and Associated Terms" (PDF). 12 April 2001 (As Amended Through 19 August 2009). Archived from the original (PDF) on 8 November 2009. Retrieved 1 February 2014.{{cite web}}: CS1 maint: others (link)
^Sagan, Scott D. (Summer 1985). "Nuclear Alerts and Crisis Management" (PDF). International Security. 9 (4): 99–139. doi:10.2307/2538543. JSTOR 2538543. S2CID 154595250. Archived (PDF) from the original on 2016-03-04. Retrieved 2013-05-04 – via Project MUSE.
^"Emergency Action Plan (SEAP)" (PDF). United States Army Corps of Engineers Savannah District (CESAS) Plan 500-1-12. 1 August 2001. Archived from the original (PDF) on 2013-02-03.
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prestige bordering on humiliation". The worldwide US Forces DEFCON 3 status was returned to DEFCON 4 on 20 November 1962. General Curtis LeMay told the President...
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incursions and submarine deployments to NORAD, pushing them to increase the DEFCON level toward a retaliation that will start World War III. David learns the...
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