Col Nierra is a commander in an
organisation unknown outside of the DKK. The Bureau of Genetic Purity
(AGR) is a product of Krieg’s experiments producing humans for the Imperial
war machine. Occasionally there emerges a genetic mutation which
results in the individual becoming a ravening beast. Not in a good
way. Where the curse of the Wulfen does not interfere with the canix
helix carrier’s decision making ability (ie which side he is on) the
fault in the Kreigers produces an indiscriminate monster (“Strigoi”)
which attacks the nearest target. The AGR recruits experienced
quartermasters; the quartermasters of DKK armies keep track of the
health of all the soldiers he is responsible for; so they experienced in
managing clinical healthcare. This gives AGR officers obvious
advantages when it comes to screening any cohort for signs of
mutation. 
Most DKK Soldiers do not know who these AGR officers are, but are conscious that these people make their own quartermasters twitchy. And of course the AGR represents another strand of their ethnic shame; so the there is no likelihood of anyone outside of the DKK finding out who they are.
They are not in the business of exterminating or decimating units. They are hunting for individuals in whom this dangerous mutation has manifest. So they have powers of investigation, seizure of evidence and arrest and/or execution without trial of individuals. In game terms, a Colonel of the AGR would use the profile of the Lord Inquisitor.
Col Nierra in particular is wily old fox with nearly a century of experience on the battlefield and on the hunt for the mutant. He has learned to pre-empt what it likely to happen and developed ways of getting where he needs to be by the most expedient means.
He is also largely cybernetic, which makes him extremely tough and hard to kill. And also slow.
He has an Initiative of 5, which also covers his immediate retinue. He also benefits from the Scout, Move Through Cover, Slow and Purposeful and I’ll be Back USRs. All except I’ll be Back extend to any unit he joins.
A AGR Officer has a retinue the same as a Platoon Command Squad. These are generally veterans drawn from the remnants of DKK units. Col Nierra always refers to his veteran bodyguards as Rosencrantz and Guildenstern. He has never explained this to everyone. BGP soldiers are viewed as taciturn and serious by other DKK soldiers.
1st Lt Unkatherin Kershin was formerly a platoon commander in the Necromundia 8th (“the Spiders”) Col Nierra once found himself witness to her insight and ability to disengage. He recruited her (how ? Who knows) and has managed to retain her services by having her trained as a pilot for Valkyrie class airframes and STAMPs (Small Tactical Airel Mobility Platforms – Col Nierra has managed to secure one of these for his team on Devos IV). She is loyal to Col Nierra and believes Starshy Kapitan Stravar to be a dick head. But like her DKK colleagues, she doesn’t say much. 
