Civilian Emergency Instructions, abbreviated CEI, were a set of documents provided to the civilian population of Arcadia, and presumably other Human colonies as well. The documents provided instructions on basic survival and evacuation procedures in the event of a Covenant attack.[1]

List of documentsEdit


  • Halo Wars (First appearance) (Mentioned only)


  1. Spirit of Fire: Civilian Emergency Instructions, Arcadia State of Emergency

See alsoEdit