Perry universe(Covers information from the S.D. Perry novels) Sean Olson' was a member of Squad A, Delta Platoon in the Umbrella Biohazard Countermeasure Service. He was killed during the drop in at Raccoon City in September, 1998. Sources ↑ S.D. Perry. Resident Evil: Nemesis. v • d • eUmbrella Biohazard Countermeasure Service membersGo back to: Lore navigation Retrieved from "https://residentevil.fandom.com/wiki/Sean_Olson?oldid=282522" Categories: UBCS members Male characters Deceased Community content is available under CC-BY-SA unless otherwise noted.