Jill Valentine

I have to find Chris and tell him that Wesker is a traitor..
She said under her breath.

By July 1998, Valentine became the only woman to join Captain Wesker's Alpha Team, as the team's B&E specialist, positioned at the rear in maneuvers with S.T.A.R.S. helicopter pilot Brad Vickers.
In the Spring and early Summer of 1998, Raccoon City was haunted by the deaths of a number of hikers and suburban families, which involved both vicious dog attacks and group cannibalism.
With the Raccoon Police Department at a loss, S.T.A.R.S. was ordered into the Arklay Mountains in search of a suspected hideout. Bravo Team was sent out on the night of 23 July, and contact was subsequently lost. The following day, the Alpha Team was sent out to investigate their disappearance and continue their investigation. Finding the helicopter derelict and its RPD pilot, Kevin Dooley, dead and mutilated, Alpha Team was confronted by a pack of dogs, who then killed Joseph Frost. Valentine, along with Wesker, Chris Redfield and Barry Burton, fled into a nearby mansion, while Vickers, in shock, fled to the helicopter and abandoned the team.
Within the mansion itself, the four-man team split up to explore. Over the course of the night, they independently deduced that the mansion was a cover for a bio-weapons research laboratory under the control of Umbrella U.S.A., S.T.A.R.S.' biggest donor. Valentine began to suspect Burton was working against the team, owing to a series of suspicious actions, but later discovered Wesker had manipulated Burton with threats against his family. Wesker was in fact on a mission from Umbrella to retrieve bio-weapons research, then destroy the laboratory and kill the S.T.A.R.S. team to silence witnesses. The dog attacks and cannibal murders were found to have been the result of the t-Virus, a bio-weapon which had leaked out into the surrounding area.
With Wesker faking his death when activating a renegade bio-weapon-designated "Tyrant", Valentine, Redfield, Burton and Bravo Team's Rebecca Chambers escaped the lab before its destruction on Vickers' helicopter.