In "A stroll in the park", The Doctor calls the player: "human". So, are the M1 marine here. I can't remember if there was ever a final word on the M1 marine, human or cyborg. There's another terminal on the level that searchs for life forms, and it doesn't find any human, but the transmission is interrupted, so we don't really know if there are any humans or not.
I have a questions regarding Volunteers series. Is it just me, or it's mainly focused on map making? Since I'm not a map maker I'm most interested in story and game play.
As for the map's stability, I've only had one crash. No big deal. Anything by Bungie did that too ;-)