Does Black Mesa have an opposing force?

Question

Half-Life: Opposing Force was a remake of Operation Black Mesa. The Black Mesa Research Facility will be recreated from the ground up using the Source engine. [Mar 22, 2013]

Hagrid P Hazard · Accepted Answer

Half-Life: Opposing Force was a remake of Operation Black Mesa. The Black Mesa Research Facility will be recreated from the ground up using the Source engine. [Mar 22, 2013]

Does Black Mesa have an opposing force?

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