(Covers information from the S.D. Perry novels)
Carlos Oliveira was a member of the Umbrella Biohazard Countermeasure Service who was sent in to Raccoon City, Pennsylvania during the viral outbreak. He was enlisted by the mysterious "Trent" as one component in his plans of taking down Umbrella.
Carlos spent years working as a mercenary across Central America's jungles. After three years, Carlos was approached by an Umbrella recruiter in Honduras. Offered a far better wage and getting a chance to live in something other than mud shacks in the jungle, he lept at the opportunity.
- Perry, Nemesis, Prologue.