Yup. Written by Sandy Mitchell. Description found on Lexicanum:
"A Mug of Recaff (Short Story) by Sandy Mitchell: Trooper Jurgen has watched the heroic Commissar Cain defeat a heretical uprising and wants only to get him a nice mug of recaff. But the heretics aren’t quite finished just yet..."
in case if all fails when you takes on Chaos Gods in their domains, you can gets army of Jurgen's clones to accompany you when attacking Fortress of Khorne, Garden of Nurgle, Palace of Slaanesh, and Maze of Tzeentch
A "blank" is the exact opposite of a psyker, having a negative presence in the Warp. Therefore they have, as Amberley Vail, Ordo Xenos Inquisitor, puts it, "the innate ability to disrupt psychic or warp spawned sorcery."
There's a guy at my work that fits the description of Jurgen perfectly. But I can't tell him out of fear of being offensive. He's a big oaf-like dude with a goatee and sort of blank face. And he sits in the middle of the call center I work at. So I always have to walk by his desk on the way to my area and I have to hold my breath because he always has an odor of used tennis shoes!