There are three Half-Life Op For Screenshots on GA-Source, though only one, the middle shot with the muzzle flash, is new, as both the crowbar pics previously appeared in PC Gamer Online (thanks Dave Johnston). Opposing Force is Gearbox Software's upcoming official add-on for Half-Life where your role in the disaster in the Black Mesa facility is containment, rather than cause, as you play an elite special forces soldier sent in to track down scientists and write graffiti on the walls.