GHPC's devs do not have any direct mod support! You have to use external programs to mod the game; separate vehicles, infantry, and many major features cannot be added.
GHPC's devs will not fix bugs or crashes on modded versions of the game.
MelonLoader is not developed by GHPC's devs.
Mods could include viruses and may damage your PC. I've never found this, but make sure to scan them on an antivirus.

Browse with caution!
This is not being updated due to me no longer playing the game, and I will not be updating it until further notice for any reason apart from security vulnerabilities and the like. Please alert me in the comments if this happens.

Melonloader is the only known way to load mods into GHPC. You need to use 0.6.1 due to the fact that versions published after remove the ability to load mods via file order (e.x. 0.6.1 loads AASuperAwesomeExplosions and then ZZCoolThingsThatDoThings, whereas other versions load them in whatever order they like).
MelonLoader is very simple to install; download installer, two clicks, you're in. It may flag as a virus, however, due to weird things that I don't understand. Rest assured that, as long as you get it from here, melonloader is perfectly safe.

https://github.com/LavaGang/MelonLoader/releases/tag/v0.6.1

Once again, do not download any version other than 0.6.1.

Once you have MelonLoader downloaded, you're ready to download some actual mods.

Modders will always find a way, and even in games where it's very, very hard to mod the game, some special modders will.

Mods can be found on the Gunner, Heat, PC! Discord[discord.gg] in the #modding section. You can post questions, download mods, and... uh, that's about it. There are some amazing mods and amazing modders there, so make sure to check it out.



You absolutely should see this post[discord.com] (will not load if you're not in the Discord) by SwissAdmiral, which details some crucial things you need to know as well.



I personally use these mods:
M1A1 Abrams AMP
Pact Increased Lethality
Any Tank Any Campaign
Gunner, Mod, PC!
50mm Bradley

Happy Modding!

And to the brave modders that actually make mods: Thank you, and good luck.

I no longer play the game. This section is outdated. Some new modders may have entered the scene that I do not know of. Do your own research.

Some people may be concerned about adding in mods. Here's a list of trusted modders that I know aren't gonna hack you. This list does not include every modder, and even if someone isn't on this list, they're still probably not trying to destroy your PC. Note: This is NOT a list of mods. This is a list of users and the mods they've made. I may have missed some.

ATLAS (Pact Increased Lethality, M1A1 Abrams v1.1.5, Manual Loading, M2 Sound Replacement, M113 TOW, Lawn Mower, Random Night Battles, 50mm Bradley, apparently this guy has made a lot of mods.)

Cy / Heat Shell Enthusiast (M1A1 Abrams AMP v2.4, Any Tank Any Campaign, NATO ERA, M6A2 ADATS)

SwissAdmiral (Yugo Pack, T-64B, note: also a trusted modder helper)

Andrix (Gunner, Mod, PC!)

This list may not be updated. As you can see, the majority of GHPC's mods are made by one guy.

Happy modding.