If you destroy by orbital bombardment a gremak pirate planet (kill all population), and there were marauder raider companies alive after all planet population was killed, when a colony is established there it will get those troops as standing militia. They are not transportable however. This happens alot for me early game since the marauders seem very resistant to bombardment, often taking hits with no effect.

Possibility is that marauders are supposed to be a population type?

Chasm wrote:Possibility is that marauders are supposed to be a population type?

Marauders are now a special type of ground unit -- infantry raiders. (In earlier build, they were a population type.)

That you can colonize a planet and get them added to your new colony is a bug