Has anyone else tried Brass Brigade? It's a slightly cartoony-looking SP-only FPS/3PS set in WW2, with battles involving British, US, German, Soviet, and Japanese forces in quite a few battles.

https://store.steampowered.com/app/1163910/Brass_Brigade/

The name is silly, but don't be put off too much by that, or the graphics. It is very fun, and being actively worked on by a single dedicated dev. It's also less than US$10, and it's a nice way to while away a few hours in quarantine.

Recommended!