Built off Andrix's mod at https://github.com/Andrix44/GunnerModPC but adds a few more things:

• A lot of inactive vehicles on the Grafenwoehr tank range for better rangefinding practice. Several other vehicles have been added too with different ammo loadouts
• The Replen Reaper, Kinetic Key, Reservist Recon, and Claustrophobia missions have been modified. I'll leave the spoilers out of the readme.

• Install MelonLoader v0.6.1: https://github.com/LavaGang/MelonLoader.Installer/blob/master/README.md#how-to-install-re-install-or-update-melonloader.
• Copy GHPCMissionsMod.dll to \Gunner, HEAT, PC!\Bin\Mods.

You can simply build the project with Visual Studio, but first you have to fix the references so that they point to your game DLLs.