Half-Life: Opposing Force

**Half-Life: Opposing Force** is an expansion pack for the acclaimed first-person shooter game **Half-Life**, developed by Gearbox Software and published by Sierra Studios. Released in November 1999, it serves as a narrative extension to the original game, allowing players to experience the events of the Half-Life story from a different perspective. In **Opposing Force**, players assume the role of **Adrian Shephard**, a U.S.