Palamok

Palamok is the Drone homeworld. In the Halo 3 Limited Edition manual, it says that Drones are suited to fighting on the Earth's surface so it's likely that Palamok is similar to Earth. The multiplayer map Guardian might be set on Palamok as you can hear the screeching of Drones in the background. If this is true then Palamok is also inhabited by pterodactyls, and there is a strange green fog that covers the planet.