I want an FPS game in this setting.

Take a look at the Resistance series.

It was a play station exclusive sadly, otherwise I would have.

Wake up, and smell the ashes.

Why do people think Resistance is anything like this? They’re not even remotely similar

Because they're looking at things through a very broad lense.

@MildlyArtisticX You're the 100th billion person to make this false comparison.

I mean, there’s Iron Harvest and Valkyria Chronicles (to an extent.) Both are strategy games. They both have that sorta “Trenchpunk” vibe where they’re heavily based on WW1 and the interwar period. Valkyria Chronicles does not have mechs unfortunately.

I could've sworn there was an indie game, but I found a game for the one set in the modern day instead of WW1

Resistance: Fall of Man?