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The Hazardous Environment Combat Unit is dispatched to the facility to fight the aliens and regain control of Black Mesa. They are featured in Half-Life, and its expansion packs, Opposing Force, Blue Shift, and Decay.įollowing the catastrophic Resonance Cascade at the Black Mesa Research Facility, bizarre aliens from Xen teleport into the complex and begin attacking personnel. They especially hate you, Gordon Freeman, personally - because you have cut down quite a few of their buddies. The more you know about the project, the more they want to kill you. It is their job to execute anyone with knowledge of the research project that went awry. Human military units sent in to "clean up" the base following the disaster. In the Half-Life Audio Script, the HECU Marines are described as follows:
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The HECU are part of a "dangerous and very efficient clean-up crew", and are supposed to work in concert with the Black Ops and the Black Mesa Security Force. The Marines of the HECU are specially trained to deal with a variety of indoor combat situations, particularly involving a dangerous environment and unconventional enemies.