Hazardous Environment Combat Unit

"'Don't shoot! I'm with the Science Team!' - Unnamed Scientist" The Hazardous Environment Combat Unit (HECU), frequently referred as just Marines, Grunts, Soldiers, or Military, is a U.S Marine detachment deployed to the Black Mesa Research Facility under explicit orders to interrogate the personnel and silence the facility. Being met with vicious attacks from Xen forces, the bewildered marines response was to slaughter alien and human alike. During this brutal cleanup the HECU would attempt to silence Freeman multiple times, initially encountering him in his attempts to reach the surface. Freeman would quickly earn a reputation as a murderer, with some marines even theorizing that he somehow sabotaged the Anti-Mass Spectrometer, though all his actions were taken in self defense. After several days the HECU would attempt to pull out of Black Mesa, though the ability for Xen forces to simply teleport in anywhere resulted in mass casualties during this desperate retreat. Later, after Black Ops were sent in, the HECU marines had no chance to survive.