Mods are good for satisfying weird cravings, and this mod (a mix of RTS and FPS gameplay) is one such contender. As in many mods, there are two teams. In this case, it's the Marines vs the Kharaa. And here's the cool bit: The Marine team chooses one person to act as "commander." For that person, the game turns into an RTS. They get a top-down view from which they issue orders, purchase upgrades and monitor troop movements. Everyone else on the team, meanwhile, plays an FPS version of the map. Good stuff!