An alert state, alert level, or state of alert is an indication of the state of readiness of a country's the armed forces for military action to respond to military attack, terrorism, or natural disasters. The phrase frequently used is "on high alert".U.S. Military on 'High Alert' [Retrieved 2013 April 12] Examples of scales indicating alert state are the DEFCON levels of the US military,R. van Dijk Encyclopedia of the Cold War, Volume 1 South Korea's "Jindogae" system, and the UK Threat Levels.Home Office Terrorism and national emergencies [Retrieved 2013 April 12] High alert states are synonymous with "red alert".
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