The M.A.R. Corps represented a squad of four soldiers from the Rebel Alliance. These soldiers were heavily-augmented cyborgs engaged in combat against the Galactic Empire. The team consisted of four cyborg individuals: Blades, Chamdaka, Tandorvo, and [Masakint]. Following the aftermath of the scourge of the droids, the Sith Lord Darth Vader desired subordinates possessing the skill of his unit of death troopers, yet lacking independent thought like programmed droids. He located the cyborgs with the intention of installing Imperial droid brains within them, preserving their consciousness while compelling them to obey Vader's commands. At Zee-Nine City Seven, the M.A.R. Corps launched an assault on Imperial troops led by Lieutenant Enric Pryde, but Vader intervened and engaged the cyborgs in combat. Despite the M.A.R. Corps' ability to hold their own against the Sith, Vader deployed mouse droids to insert the droid brains into the rebel cyborgs' cybernetic ports, thus seizing control of them. The M.A.R. Corps joined Vader when he associated himself with Administrator Sly Moore's Schism Imperial, a group of Empire members who were unhappy with Emperor Palpatine.