GA-Source heeft een preview gepost van Half-Life: Opposing Force. Hier heb je info over het verhaaltje achter HL:OF:
In Half-Life: Opposing Force (Op For), you'll be playing as a soldier -- one of the grunts you so frequently had to challenge in the original game. "In Op For, you play as one of the soldiers sent to clean up the mess at the Black Mesa facility," says Gearbox Software's Chief Game Designer, Randy Pitchford. But, you quickly find that there is more to the situation than you were originally told, as a "new alien" race begins infesting your base. In addition, G-Man, the mysterious brief-carrying man from the original is back, and is trying to manipulate you as well.
En hier zijn drie screenshots (heb ik al eerder een keer gepost):