They were standard clone troopers, drawn from rank-and-file formations, who had shown some potential for "dirty work", and were trained by Null ARCs N-10 and N-5 in commando tactics. However, the "dirty work" they were sent out to do wasn't always as clear-cut as expected: covert ops troopers were occasionally sent to eliminate other clones who had chosen to desert from the Republic and live their own, independent, lives.