"Ultramarines. There are many chapters throughout the Imperium. We fight the enemies of the Imperium." So, you know, heavily armed religious lunatics.

"We can have a momentary suspicion--I believe most do--but few are trying to study it." He is, but he doesn't have the resources to make the right connections. He sighed. "People here assume that because their world is safe, and leaders are honest, that this is true here as well." They always think he's wrong, and they're right.