Jack Krauser

Always on War
Jack Krauser was a veteran soldier, to the point there was nothing left in his life but war, when he wasn't on service, he was doing mercenary work. He was Leon's partner in the Operation Javier in South America's Amazon rainforest that was tasked with killing Javier Hidalgo, a drug dealer who had obtained access to Bio-Organic Weapons. As their mission progresses, Krauser becomes more entinced with Javier's mentality of "Become stronger to survive", and becomes obsessed with the t-Veronica, which leads a disguised attempt to get it to lose his left arm. As they dispatch Javier, Jack becomes fully convinced of Javier's words and calls Leon a coward. After the mission, he committed suicide after being decommissioned by the loss of his arm. Or so he makes it seem, he had secretly joined Wesker seeking the power of the biological weapons, whom restored his arm.

Season 3
Jack was tasked with defeating Leon so Wesker would grant him his mutations, but failed. Nevertheless he grabbed some Praga and got a cool slicing arm before being killed by Ada Wong.

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While Leon S. Kennedy continued exploring the vents, suddenly he found himself back in the Las Plagas incident, but, was it the real Krauser he fought...?