I was gonna say that, much as I use Linux and play milsims on it, Command: Modern Operations is a pretty prominent hard milsim — like, exiting the “game” side and getting closer to the “non-game sim” side — and is one of the very few Steam games that I can’t run on Linux, but apparently, looking at ProtonDB, it can now run on Proton. Only a bronze rating, and according to some of the people there, takes some tweaking, but it runs. Huh.