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Black Mesa: Protocol X is a Black Mesa add-on that aims to recreate the award winning Gearbox title "Half-Life: Opposing Force". Using Black Mesa's assets - as well as self-made assets - Black Mesa: Protocol X will feature new models, dialogue, and new environments. NOTICE: MOD HALTED.
Soundtrack of BM:OPFOR
Compose By X-RaY
I was expecting the music to go 'crazy' after 1:15, but still good :)