Interesting things on the horizon. While messing about in dev mode, I checked the spawn pawn menu to find space soldiers next to space refugees. Spawning them in, they seemed like extremely well equipped fellows, but belonged to no faction. Is this Vanilla Rimworld and just part of raids I haven't gotten to yet as of year 2?
Spacers don't raid, they come from escape pods and cryo pods.
If you find one out of a cryos I recommend attacking them before they walk off someplace so you can get their good gear