Daemonhunters
Daemonhunters are a branch of the Imperium's Inquisition specifically for hunting the manifestations of the warp. These are further divided into Inquisitors and a special form of Space Marines known as the Grey Knights. The Inquisitors can be found surrounded by many different branches of the Imperium's Militant forces due to their ability to call on local governance for support. Something strange, in your neighborhood, Who ya goina call? Deamonhunters!