Throughout the Resident Evil series, several Umbrella-owned
paramilitary units were introduced, driving the plot and providing new enemies and allies.
Umbrella Security Service (U.S.S.)
The Umbrella Security Service (Special Forces Unit) (USS or USFU) were first introduced in Resident Evil 2. USS Alpha team attempted to steal a sample of the G-virus, causing the city-wide outbreak in the game. Delta team appeared in the
prequel Resident Evil Zero; Delta team was sent in to blow up the Ecliptic Express after the trouble occurred, but was overwhelmed by the leeches and wiped out. Delta team was under the direct command of Wesker and Birkin.
Other games give further background for the Umbrella Special Forces. According to Code: Veronica, USFU agents are trained at the
Rockfort Island facility.
One of the more notable members of the USFU,
HUNK, appears first in a minigame in Resident Evil 2, where he is given the mission of retrieving the G-virus from the research facility under Raccoon City.
Canonically, he is the only survivor of his squad's mission.
USFU agents are always depicted in solid-color grey fatigues, wearing protective vests and
gas masks (except in Resident Evil: Apocalypse, where they are depicted in solid black fatigues, vests, and a type of enclosed helmet). They report directly to the highest ranking officers in Umbrella. Unlike the UBCS which performs more visible missions such as rescuing civilians, this unit maintains total secrecy and a small size. Also unlike the UBCS, this unit's personnel are not considered to be expendable. Members of the USFU are ex-military, highly trained, and dedicated to protecting Umbrella's various assets.
Umbrella Biohazard Countermeasure Service
The Umbrella Biohazard Countermeasure Service (UBCS) was introduced in Resident Evil 3. Numerous squads of UBCS soldiers are 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 (who never expected their forces to be wiped out). One of their members,
Carlos Oliveira, is a main character in the game. UBCS members are also depicted in Resident Evil Outbreak-Files #1 and #2- andThe Umbrella Chronicles.
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." In Resident Evil: Apocalypse and Extinction they are referred to as the Umbrella Biohazard Countermeasure Force.
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Supervisors
The Supervisors are introduced in Resident Evil 3 and further fleshed out by documents in The Umbrella Chronicles, where they are referred as "Monitor". They are also known as "Observers" in the book Resident Evil: Archives. The Supervisors are part of an internal espionage organization within Umbrella meant to monitor suspicious activity among its own employees. Supervisors are usually placed throughout the corporation and maintain the image of normal employees in order to help them conduct their spy activities. Several Supervisors were placed among the UBCS, one of whom was
Nicholai Ginovaef. Their orders range from spying on fellow employees and destroying evidence to cleanup operations, including assassinations if required.
Umbrella Trashsweepers unit
Resident Evil Survivor includes a force known as the Umbrella Trashsweepers, also known as the Undertakers or Cleaners. Cleaners appear to have uniforms similar to those of Umbrella's Special Forces Unit, with body armor, gas masks, and gray
battle dress uniforms. Their role is to destroy all evidence of a viral outbreak, including survivors.
http://en.wikipedia.org/wiki/Umbrella_Corporation
