The Big Rok. The stuff of legends among many boyz of the galaxy. Not really a rok anymore, but a massive space hulk, cruising through the stars, ramming into anything in its path, incorporating it into its ever-growing whole. Its oldest inhabitants, as the name could imply, were orkz.
Not just any orkz, though. Blood Axes, they had once been, considered extra un-orky even among their own kind. Willing to actually coexist in one place, as long some fighting broke out now and then. Well, more like every day. They had originally wanted to search for a little planet to call home, before a then-unnamed hulk materialised from the warp and rammed right into their rok.
The orkz spilled into this unexplored area and, other than a few oversized bugs, found it to be miraculously abandoned, some parts of it even overgrown with plant life. It was then that Balrog, their warboss at the time, declared the area 'orky enuff' and crowned himself the first Rok Boss. He died two days afterwards when a successor shot his head off, but that is another tale.
Big Rok proved to be marvelous home, with abundant resources, forgotten technology for the meks to toy with and enough warp-blessed ground to reproduce. And since it seemed to have a habit of ramming into ships, new visitors also came around now and then. Most of them were chopped to pieces afterwards, but that's just how it goes when you deal with orks.
Today, many splinter groups form the populace of the Big Rok. Gangs, factions and just plain old troublesome boyz often cause trouble. But, with Blood Axe blood coursing through their veins, there was a need for at least a certain level of discipline. And so, they were created.
Chosen from the best, the strangest, or the willing. The greatest, and only, force dedicated to the preservation of a minimum level of civility among orks, but only during peace time. They are the defenders of just teef distribution and red paint quality assurance. They are the orkiest of the un-orky.
They are...
Da' Big Rok Polees Departmunt. And dey'z gunna' smash ya' if ya' cause trouble, ya' git.