SciFi at War is an interesting mod for Star Wars: Empire at War that we recently stumbled upon. It mashes up different franchises, such as Star Wars, Star Trek and Battlestar Galactica, into one mega game. The video below shows various Halo ships fighting craft from Wing Commander. It doesn't seem like the WC fleet is fully fleshed out, and I can't quite tell if the mod is still active, but it's a pretty cool concept! You can grab it at the Steam Workshop. If this just makes you want to play a WC RTS game, you can check out the WC Invasion mod, which is also for Empire at War.