Gearbox Software
Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S. Marine, one of the enemy characters in the original game. The player character, Adrian Shephard, is sent in to neutralize the Black Mesa Research Facility after a scientific mishap causes it to be invaded by aliens, but quickly finds that the Marines are outnumbered and slowly being beaten back by a second alien race and black operations units.
Major but easily missable feature as of the 25th Anniversary Update for Half-Life: The game's launcher, hl.exe, can be renamed to the name of the mod folder of the specific mod you want to play. You can also copy it mutiple times in the game folder and however many mods you have installed you can make a copy of the exe for each one and just rename them after the folder [e.g., Blue Shift is 'bshift', so it will be renamed to 'bshift.exe'] for a much easier way to run GoldSrc mods. I did this for Blue Shift and OpFor, as well as Decay. -vλ
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