Sergeant R. Siwiak was a member of the United States Colonial Marine Corps aboard the USS Sephora when it discovered the USS Sulaco orbiting above Acheron (LV-426) in 2179.


Sergeant Siwiak led a flamethrower unit into the Sulaco. He proved just how effective fire-based weaponary is against Xenomorphs, until Xenomorph acid punctured his fuel tank.


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