Hazardous Environment Combat Unit

The Hazardous Environment Combat Unit or HECU is a special operations branch of the U.S. military that specializes in surviving in harsh environments unsustainable to regular soldiers. They are introduced as one of the antogonists in the FPS thriller Half-Life, where their job is to combat the oncoming alien invasion at the Black Mesa Research Facility, and silence the facilities science team in a cover-up operation. They are main antagonists to Goron Freeman, and Barney Calhoun.