Old FPS Game WW2 Game?

Does anybody recall what the name of an old F2P FPS game that came out years ago? It was WW2 theme and I think it started with a C. I heard about it from here back in the day and I can't get that lobby song out of my head. So I was curious if anybody remembered what it is called? Polleus was the one who told me about it.

Thanks!

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