During Operation: NESTWRECKER, Birkin took a resist againts them, causing J. Martinez 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.
The mutated Birkin then ran after the team, decimating it's ranks. HUNK, however, managed to survive, and attempting to reach the roof of Raccoon City Police Station to being evacuated by a helicopter.
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 anyway.