I have my gang.

===
IN THE GRIM DARKNESS OF THE FAR FUTURE, WAR RAGES THROUGHOUT THE GALAXY. MANKIND IS UNDER SIEGE ON ALL SIDES FROM XENOS, HERETICS, AND THE TAINT OF CHAOS. THE SPACE MARINES, THE IMPERIUM'S FINEST SOLDIERS, BRING WAR TO THE ENEMIES OF MAN. THEIRS IS AN ENDLESS FIGHT, AS THEY WORK TO SAVE MANKIND FROM ALL ITS FOES.

(record needle scratch)

DIS AIN'T DERE STORY

SOMEWHERE IN DEEP SPACE, A BUNCH OF ORKS HAVE DONE DA IMPOSSIBLE! DEY'VE TRICKED DA IMPERIUM INTO THINKIN' DEY'Z SPESS MEHREENS! SPESS MEHREENS GET ALL DA BEST FIGHTS- SO IT'S ONLY FAIR DA BOYZ STEAL SOME OF DEM.
===

So yeah. Deffwotch, a bunch of orks disguised as Space Marines and relying on the ignorance of the Imperium's Citizens to do so! Currently on vacation to fight some orks.