I'm somewhat interested, thanks to Tracker. And as to Kalas' question, as I understand it, most marines carry a close combat weapon of some kind, but it's not limited to a combat knife. some have chain weapons and some have other, weirder shit. Chain axes were more common before the Horus heresy, and their use was seen mostly amongst the legions that turned traitor. While it's not outside the realm of possibility, a chain axe could almost be considered a relic weapon since they are so rare in the service to the emperor. That is my take on it at least, you'll want to ask buddy-whats-in-charge though. Considering what I know of the dark angels, which is limited to be fair, you probably won't get a chain axe...