Upon discovery of a Covenant presence on Reach, Noble Team declares WINTER CONTINGENCY, July 24th, 2552. (Halo: Reach)

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WINTER CONTINGENCY was a UNSC emergency plan directive that was declared whenever it was determined the Covenant had learned the location of a colony world.  It was most notably declared upon discovery of the Covenant on Reach in 2552.

Related Media

Declaration of WINTER CONTINGENCY is depicted in the video game Halo: Reach.