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In United States military doctrine, ALERTCON is an abbreviation of alert condition, and is a measure of the level of action and readiness to be taken in a given situation. LERTCON is used by US and Allied forces assigned to NATO.[1] There are specific procedures laid out for responses to changes in LERTCON. LERTCON levels can be broken down into high-alert emergency condition levels (EMERGCONs) and the more common Defense Condition levels (DEFCONs).


  • LERTCON 5/4: Peacetime conditions
  • LERTCON 3.5: Military vigilance
  • LERTCON 3: Simple alert
  • LERTCON 2: Reinforced alert
  • LERTCON 1: General alert


  1. Duke, Simon (1989). United States Military Forces and Installations in Europe. New York: Oxford University Press. p. 287. ISBN 0-19-829132-9.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

See also