The Umbrella Biohazard Countermeasure Service (UBCS) was a private military force owned by the Umbrella Corporation, specializing in rescue operations during biohazard outbreaks. It was founded by former Soviet Colonel Sergei Vladimir. The U.B.C.S. primarily recruited former soldiers and militiamen who had been incarcerated and, thus, could be offered a new life. At its largest in 1998, this force consisted of at least four platoons, designed Alpha through Delta, making for a compliment of as many as 120 mercenaries. It suffered near total destruction during the operation in Raccoon City.
Over the course of the 1990s, Umbrella's t-Virus Project advanced through to Phase 3 of its development and production of working prototype Bio Organic Weapons was taking shape. Due to the serious health and security risks posed by escape prototypes, Umbrella sought the establishment of a dedicated anti-B.O.W. force distinct from the Umbrella Security Service. These mercenaries would then be provided with experimental antiretroviral drugs to limit the risk of an outbreak among the unit during an incident. Umbrella scouted around the world for recruits, ranging from retired Soviet Army officers to terrorist prisoners on death row. With the end of the Cold War, these recruiters had a number of successes recruiting from former Warsaw Pact nations and the former Soviet Union.
Over the course of 1998, a series of t-Virus outbreaks in the Arklay Mountains drew the attention of Umbrella. This began with acts of sabotage at facilities in Raccoon Forest in May, resulting in the virus slowly spreading across the region. After three months the virus had made its way into Raccoon City with isolated reports of "monsters". After a week this escalated to a recognised public health matter and Raccoon General Hospital was under lockdown due to increasing numbers of inpatients suffering from Cannibal Disease. Owing to this and concerns with the local Umbrella leadership, the U.B.C.S. was placed on stand-by on Tuesday 15 September. In the evening of Tuesday 22 September, the USS raided the Umbrella Chemical Plant on the edge of Raccoon City, intent on recovering the experimental G-Virus in the NEST laboratory complex beneath. The raid backfired, leading to a chain-reaction of events resulting in the contamination of the Victory Lake reservoir with ε strain by the start of the following morning.
Battle vs. Mobile Task Force Epsilon-11 (by EDMUND456)[]
UBCS: 
MTF: 
6 UBCS Soldiers arrive on foot to a seemingly abandoned town. They have been sent there to perform an anti-B.O.W. operation. Not far from there, a helicopter drops off a squad of 6 Mobile Task Force operators. They have been deployed to counteract a raid performed by a hostile Group of Interest on a nearby site. The two groups then meet at an intersection.
One of the Mobile Task Force operators, believing the UBCS soldiers to be the aforementioned hostiles, fires his Crossvec at one of them. The burst of bullets hit a UBCS soldier in the chest and as he falls to the ground, everyone scatters whilst exchanging fire. As the UBCS soldier lies injured on the ground, another MTF operative passing by finishes him off with his COM-18.
UBCS:
A UBCS soldier takes cover behind a dumpster with his M4 Carbine ready. He has it set to AUTO mode because he wants to quickly finish off his enemy. An unsuspecting MTF operator then approaches the area. This prompts the UBCS soldier to jump out of his hiding spot and ambush the operator. The hail of fully automatic gunfire in close quarters instantly kills the operator.
MTF:
In another part of town, two UBCS soldiers are firing their Submachine Guns at an MTF operator taking cover behind some debris. But due to both of them firing at the same time, they eventually need to reload at the same time too. This gives the MTF operator an opportunity to take them out one-by-one with his MTF-E11-SR.
UBCS:
Meanwhile, the MTF operator that started the fight finds himself alone in an alleyway. He encounters a UBCS soldier and fires at him with his Crossvec. The UBCS soldier nearly dodges the bullets by diving behind a corner. The fast fire rate of the weapon causes it to run out of ammunition quickly and the closed bolt locks open. While he is trying to reload his gun, the UBCS soldier shoots him dead with his Submachine Gun and runs to join the rest of his squad.
MTF:
Now, all that is left of the UBCS squad, The UBCS Squad Leader and his last two men, plan to escape this town and exfiltrate immediately. Just as they're about to make their move, the remainders of the MTF squad ambush them. A UBCS soldier is gunned down while the rest start running. A stray shot hits a building causing some small pieces of debris to fall on the MTF operators but because they're wearing helmets, they are unfazed. The same couldn't be said for the last UBCS soldier who is shot in the head with a 5.56 round. This leaves the UBCS squad leader as the last survivor. He is injured and takes cover behind a ruined building.
UBCS:
The UBCS squad leader knows he has to make his last stand so he takes out his Merc's Handgun and aims it at the corner. An MTF operator runs around and is shot in his face. Then the MTF Captain appears too but his shot in the torso where he is protected by kevlar. He then guns down the UBCS squad leader with his MTF-E11-SR.
MTF:
UBCS: X
The Mobile Task Force Captain then uses his radio to contact command to inform them that they may need backup if they're going to raid the site.
Expert's Opinion[]
Epsilon-11 won because they had better equipment and were furthermore better trained compared to the UBCS.