Operation: Harsh Doorstop on Steam
store.steampowered.com
Operation: Harsh Doorstop is the ultimate, free to play, tactical shooter sandbox. Play singleplayer, multiplayer, or co-op modes and explore thousands of community-created maps, weapons, and vehicles via the Steam Workshop. Created by ex-developers of Squad, Red Orchestra, and Insurgency.

This has quickly become my favorite big map vehicle battlefield-like because the gameplay is really solid and part of the core focus of the developer is creating a free moddable platform for others to create new types of games on. Even if tactical/milsim type games aren’t your thing there are already mods like “Casualfield” that make the gameplay much more like call of duty or battlefield.

Check it out!

p.s. the game is getting review bombed by trolls ignore the “mixed” rating, the game has some rough edges, but it is legitimately great fps as it is