Alpha Team was a U.S.S. (Umbrella Security Service) team of an unspecified size sent to retrieve the G-virus from William Birkin. Two men from Alpha team were tasked with taking Birkin's G and T samples, whilst the others guarded the sewers.
During their infiltration into Birkin's laboratory, a member of the team opened fire on Birkin, leaving him gravely wounded as they took the briefcase containing the both viruses. Birkin, however, was holding a sample of the G-Virus as the event occurred, injecting himself with it.
Until Resident Evil Outbreak File #2, HUNK was thought to be the only Alpha Team survivor. But with it was revealed on a unused Outbreak character list that Miguel somehow survived the initial attack with a head injury, but was later killed by anyway.