The mod in my sig is one that remade C&C Renegade into a FPS based on Red Alert 1. There's no single player campaign, but the online is even better than Renegade IMO, although there's even less player base these days. Renegade is still a lot of fun though.
https://youtu.be/_ivwaPFzQvM?si=WVH_Isd_ysWZZFMd
Red Alert: A Path Beyond - The FPS based on C&C Red Alert
Download and play for free at http://w3dhub.com/