
1) Defence condition 2) Measure of military alertness 3) Military alert number 4) Military alert quantifier 5) Military alert status 6) Pentagon alert rating
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https://www.crosswordclues.com/clue/defcon

The defense readiness condition (DEFCON) is an alert state used by the United States Armed Forces. The DEFCON system was developed by the Joint Chiefs of Staff 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 seve...
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http://en.wikipedia.org/wiki/DEFCON
[video game] June 15, 2007 (UK retail) April 15, 2007 (United States) April 19, 2007 (Macintosh) |genre = Real-time strategy |modes = Multiplayer |platforms = Windows DEFCON (stylized as DEFCOИ) is a real-time strategy game created by independent British game developer Introversion Software, developers of Darwinia, Multiwinia, Uplink, and ...
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http://en.wikipedia.org/wiki/DEFCON_(video_game)

Defence Condition
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http://www.encyclo.co.uk/visitor-contributions.php

See defense readiness conditions.
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https://www.encyclo.co.uk/local/21254

any of several alert statuses for U.S. military forces, ranked numerically from normal, 5, to maximum readiness, 1.
Found on
https://www.infoplease.com/dictionary/defcon
No exact match found.