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Zombies., Maps and mods that contain at least one Antlion Guard., Maps and mods that feature a Black Mesa style setting., Maps and mods that feature lots of Poison Headcrabs." />
Play an HECU Marine in seven distinct operations.
Visit different sections of the Black Mesa Research Facility, some of which featured in Half-life, Blue Shift & Opposing force!
You and your squad have got some serious work to do – GET TO IT SOLDIER!