I don't know what XSTR! means, but Freespace campaigns seem to like having random guys say it, including Command, wingmen, capital ships, etc. I had initially thought it was limited to one campaign (I forget which one; I've played several recently and just wrote it off as random weirdness that didn't hurt anything), but it just happened again in Twilight, which I couldn't have seen it in before because I just downloaded it. I'm putting this here instead of the support forum because I don't know if it's an error or some in-joke I'm not getting among campaign makers. What gives?