(Capcom's primary storyline)
The Umbrella Security Service (abbreviated "U.S.S.") was an elite special task force under the control of Umbrella Headquarters. Agents were trained at the Rockfort Island Military Training Center.
The U.S.S. was formed at an unspecified date somewhere in the 1970s or 1980s, and was placed under the control of Umbrella HQ, with training from 1994-1998 taking place at Rockfort Island. Their earliest known mission took place in 1988 when Dr. Oswell E. Spencer gave orders for his fellow co-founder, Dr. James Marcus, to be executed. The two had become paranoid since the founding of Umbrella Pharmaceuticals and, as the company expanded, feared the other's move. A two-man team entered Dr. Marcus' lab and killed him with fire from their MP5 submachine guns.
In July 1998, the U.S.S. Delta Team was given orders to investigate the Ecliptic Express, a train carrying Umbrella person, where the passengers were killed as part of a series of coordinated attacks on Umbrella property in the Arklay Mountains which wiped out the first and second investigation units . Delta Team restarted the train to take it to its intended destination, the Umbrella Executive Training Center, but were immediately after set upon be leeches under the control of the Queen Leech.
Later that year, in September, Umbrella became concerned over Dr. William Birkin's development of the G-virus, a muta genic toxin set to replace the t-Virus. Intent on selling the virus over to the U.S. Government for military applications, the U.S.S. was quickly called in to Raccoon City to intervene in any proceedings. On September 20, police officer Carl Nielson filed a report after encountering an individual skulking through the sewers. Although unable to catch up to the man to question him, Officer Nielson did stumble onto military-grade weaponry such as C4 plastic explosives with a detonator, and a broken infra-red scope for customizing firearms.
Not long after, the two-man "Alpha Team", lead by "HUNK", trapped Birkin in his lab. With orders to retrieve a sample of the virus, the U.S.S. unit gunned down Dr. William Birkin and left with samples of the G-Virus (HUNK is actually seen here calling in the success of the mission). Leaving in a hurry to avoid detection, the two failed to notice Birkin carrying another sample of "G". Injecting it into himself, he revived himself from near death and mutated into a frightening monster ready to enact his revenge. Several U.S.S. teams in the sewers, composed of at least eight men, were swiftly executed by the renegade doctor, with HUNK barely escaping alive.
Fully regaining consciousness on September 30, HUNK made his way out of the sewers and to the Raccoon City Police Department's helipad and successfully escaped the city.
On the last day of the outbreak, the 2nd U.S.S. Squad was tasked with removing the experimental weapon Nyx from the city, operating from Main Street. The commander, Rodriguez, went rogue and attempted to steal the bio-weapon instead and offered refuge to a rouge researcher named Linda and a few survivors aiding her. A UBCS team under the command of Arnold and under the supervision of Umbrella Executive Tommy Neilson was dispatched to kill him and retrieve the stolen B.O.W. Despite the nearby area being mined, Rodriguez escaped by helicopter, but lost Nyx in the process. The rest of the squad was killed and scattered around the nearby area as zombies sometime before these events.
The last known official deployment of the U.S.S. was in November 1998, when a small U.S.S. team lead by HUNK was assigned to transport a container to Rockfort Island. The mission was controversial in that Alfred Ashford, the island base's commander, did not reveal to the team exactly what was inside the crate - HUNK was concerned over the danger of an unidentified package that could have put him and the rest of his unit in danger.
During the December 1998 attack on Rockfort by spies associated with a rival organization, the Umbrella Special Forces trainees were caught up in the fighting, with those who weren't killed by the enemy agents being infected by the t-Virus.[notes 1]
- Delta Team commander - leader of the Arklay Mountains investigation, killed by Leeches.
- HUNK - U.S.S. commander nicknamed "Grim Reaper" due to a series of missions in which he was the only survivor.
- Miguel - One of two Alpha team members to have survived Birkin's attack.
- GOBLIN 6 - An Alpha Team member injured and left for dead by HUNK in Raccoon City.
- Rodriguez - A traitor to Umbrella.
- Conrad - Was an operative of the U.S.S. in the Raccoon City outbreak.
- Derek - Was an operative of the U.S.S. in the Raccoon City outbreak.
- Luke - Was an operative of the U.S.S. in the Raccoon City outbreak.
The standard weapon used by the U.S.S. in Resident Evil 2 is the Heckler & Koch MP5 Sub-Machine Gun. Although they have been known to use other weapons such as pistols, with HUNK having his own special handgun, which he nicknamed Matilda.
In Resident Evil: The Darkside Chronicles, the U.S.S. standard MP5 is replaced with the Steyr TMP. Also, judging by the inscription on the barrel of the Custom Magnum Parts found in Resident Evil 2, the U.S.S.'s armory also contained some heavy, albeit impractical firepower; a 10-inch version of the IMI Desert Eagle semi-automatic magnum handgun chambered in .50 Action Express—when or where it could have seen operative use is unknown.
- ↑ Exerpt from BIOHAZARD CODE: Veronica kaitaishinsho, page 64:
"T-ウイルスに感染した結果、 脳細胞が壊死し代謝機能に異変をきたして、 生ける屍と化したもの。人としての理性はすでになく、 ただ飢餓感にのみ突き動かされ、人肉を求めてさまよう。本作では、 島の刑務所に収監されていた囚人やアンブレラ特殊部隊の訓練生、 島を襲撃した組織の工作員など、 多種多様な人間がT-ウイルスの犠牲となっている。"