Cleaning the streets, one infected at a time.

The Umbrella Biohazard Countermeasure Service (UBCS) was introduced after the Racoon City Infection. Numerous squads of UBCS soldiers were deployed to Raccoon City, supposedly to search for survivors and to help contain the zombie epidemic. In fact, they were deployed so that Umbrella could gain reliable combat data regarding their biological weapons—a fact known only to their supervisors.

The UBCS was founded by former Soviet Colonel Sergei Vladimir. The service is mainly composed of "nightmen", mostly former mercenaries and war criminals recruited by Umbrella and trained to deal with "problems caused by illegal products."