Half-Life 3 is still a pipe dream for me and many others, but this new fan-made expansion should tide us over until we get something concrete from Valve.
Valve's Half-Life series has quite a few alternate takes on the events via official expansions and fan-made mods, each one expanding the universe rather massively.
Black Mesa: Military is a brand new way of experiencing the events of the original Half-Life, where you take on the role of a marine tasked with securing the Black Mesa Research Facility and eliminating Gordon Freeman.
If you remember back to the events of Half-Life, the military first turns up in the chapter We’ve Got Hostiles, and they stick around until they are ordered to retreat in Forget About Freeman.
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This mod essentially portrays the events that occur between both of these chapters, showing the marines’ initial encounter with the creatures from Xen, as well as their conflict with Gordon Freeman.
Half-Life Black Mesa: Military Gives You An Alternative Perspective
“Experience the consequences of the resonance cascade scenario once again, and play as one of Hazardous Environments Combat Unit marines, Steven Mills,” reads the description for the mod on ModDB.
“You are not a survivor, you are sent on a mission. Secure Black Mesa Research Facility with the rest of your squad and eliminate any hostile forces.”
Mod creator HECUsoldier adds that “this mod is not a recreation of any existing mods” and that the team will “try to stick to the canon of the Half Life universe as much as we can and make everything believable.”
It even mentions that Gordon himself appears in person during the mod, presumably during the events of the chapter Apprehension, which ends with Freeman being captured by the marines.
Black Mesa: Military was released in 2025, but just received a rather large update last week to kick off 2026.
The update overhauls one of the game’s chapters, as well as lighter touch-ups to a few other levels.
It also adds a new custom installer to make things a little easier when setting the mod up, and there are also a few other changes with regards to weapon models, bug fixes, and AI improvements.
All-in-all, whether you're trying the mod out for the first time, or you're simply revisiting it, this update makes it a good time to jump in.
You can download Black Mesa: Military from its official page on ModDB now.