So Freedom Fighters was a video game made by IO Interactive (the same developers that made Hitman 2) that came out back in 2003 that should've gotten more love than it did. It was a third-person shooter set in an alternate history modern day, where Soviet Russia won the arms race and dropped the first atom bomb on Berlin, and so they became the more dominant power in the world. And then in the present day, they launch an invasion of the United States and occupy the country. You play as an average Joe turned resistance leader that fights against the occupation. It's like Red Dawn, except set in New York City. You had to make use of cover to avoid enemy fire, and use a squadron of up to 12 NPC fighters to flank the enemy and defend positions. It wasn't perfect, but it was pretty good, and never got the sequel it deserved.
When the Homefront games came out, some people were calling them a spiritual successor, but this was only because they dealt with "alternate history where enemy nation is the dominant superpower and occupies America." The first Homefront game was just a relatively bland FPS game that never really clicked to me, and Homefront: The Revolution was a hot mess of ideas that I couldn't even bring myself to finish.
So, let's see how I'd reboot Freedom Fighters.