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DEFCON
The defense readiness condition (DEFCON) is an alert state used by the United States Armed Forces.〔 (DEFCON is not mentioned in the 2010 and newer document)〕
The DEFCON system was developed by the Joint Chiefs of Staff (JCS) and unified and specified combatant commands. It prescribes five graduated levels of readiness (or states of alert) for the U.S. military, and increase in severity from DEFCON 5 (least severe) to DEFCON 1 (most severe) to match varying military situations.〔
DEFCONs are a subsystem of a series of Alert Conditions, or LERTCONs, that also includes Emergency Conditions (EMERGCONs). There is no single DEFCON status for the country, and in fact different branches of the military can be at different levels of DEFCON at the same time. DEFCONs should not be confused with similar systems used by the U.S. military, such as Force Protection Conditions (FPCONS), Readiness Conditions (REDCONS), Information Operations Condition (INFOCON) and its future replacement Cyber Operations Condition (CYBERCON),〔(Chairman of the Joint Chiefs of Staff Instruction 6510.01F )〕 and Watch Conditions (WATCHCONS), or the former Homeland Security Advisory System used by the United States Department of Homeland Security.
==Levels==
DEFCONs vary between many commands and have changed over time,〔 and the United States Department of Defense uses exercise terms when referring to the DEFCONs. This is to preclude the possibility of confusing exercise commands with actual operational commands.〔 On 12 January 1966, NORAD "proposed the adoption of the readiness conditions of the JCS system", and information about the levels was declassified in 2006:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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