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Emergency Contact Protocol Upsilon

From Halopedia, the Halo wiki

Emergency Contact Protocol Upsilon also known as Emergency biohazard response UPSILON, is a protocol used to limit Flood expansion and initiate full quarantine. All Unified Earth Government and United Nations Space Command rules of engagement are suspended during the duration of the containment.[1]


  1. ^ Halo: Official Spartan Field Manual, PART 09: ALIEN FACTIONS, The Flood (p. 172-175)