An alert state or state of alert is an indication of the state of readiness of the armed forces for military action or a state against natural disasters, terrorism or military attack.
The term frequently used is "on high alert".
[1] Examples scales indicating alert state are the DEFCON levels of the US military,[2] South Korea's "Jindogae" system,[3] and the UK Threat Levels.
[4] High alert states are synonymous with "red alert".
[5] Historic/Defunct: This military-related article is a stub.