Sergeant
From The Heretic Knowledge Vault
A low-level commander among the NPC Guards who work for the Veracian Church. The only cast member thus far attributed with this rank is Reeve, although there's a pretty good chance he's going to be busted back to "buck private" or possibly "crud behind the refrigerator" or just "dead guy" following his big-time screwup in the Connel affair.
The fact that this rank, unlike most of the others in the story, is also used in the real world, is probably happenstance.