Combat Knife: Another melee weapon that delivers less damage, but is very fast and effective against headcrabs or already wounded or weak enemies.Alternate fire prepares for a more forceful swing, that increases in power the longer one holds down the button. Pipe Wrench: The first melee weapon Shephard finds, the wrench is suitable for bashing crates and enemies alike.Hazardous Environment Combat Unit (If provoked).

Black Mesa Security Force (If provoked).Hazardous Environment Combat Unit members.Main article: Half-Life: Opposing Force storyline See also: Gearbox Software#Canonicity of the Half-Life expansions Characters The screenshots showing the prototype version was particularly found inside it's screenshot page inside IGN, including Steam.

On May 10th, 1999, the prototype version was currently in the works at that time, until Valve and Gearbox had skinned out plans for the new version which came out in early November. This service has since been discontinued. Originally, users with access to the back catalog, via an original copy of Half-Life or a copy of Half-Life 2 Gold Edition, could download Opposing Force for free. Opposing Force can be purchased on Steam for USD $4.99. Additionally, an unofficial sequel was previously being developed by fans named Opposing Force 2, however it has since been put on indefinite hold. A fan mod is currently in the works that will see the whole game remade in the Source engine currently titled Operation: Black Mesa. Shephard is sent into the Black Mesa Research Facility on an undisclosed mission, but things go wrong as he finds himself fighting for survival against government agents, Xen aliens, and the mysterious Race X.

The expansion's single-player mode features the same setting as the original, with the twist that the player is cast not as Gordon Freeman, but as Corporal Adrian Shephard, a U.S. Half-Life: Opposing Force is a critically acclaimed expansion pack for Half-Life, developed by Gearbox Software and released by Valve Software on November 1, 1999.

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