An acronym for the Umbrella Biohazard Countermeasure Service. Umbrella established this private force to be dispatched as first responders to incidents or disasters caused by their own products.

Generally involved in extremely difficult missions, nearly all of its members were war criminals, refugees, or criminals from death row or with life sentences, and were coerced into joining in exchange for their acquittal. A number of its members were taken from the former communist block after the fall of the iron curtain, and their excellent combat abilities and rescue operations experience were put to good use.