SD - 6 Hulk infantry droid The SD - 6 " Hulk " infantry droid was a predecessor to the Balmorran Arms SD - 9 and SD - 10 battle droid models , deployed during the last centuries of the Old Republic and the early years of the Galactic Empire . Characteristics . The SD - 6 was a fourth - degree battle droid manufactured by Balmorran Arms . With a size of 3 . 5 meters and almost the same width , it was a veritable mountain of a defensive unit . The droid was armed with two E - Web repeating blasters on each arm as well as two Merr - Sonn ion gun rifles on rotating shoulder mounts . It was also equipped with two large arms to defend itself from any enemy that should attempt to overrun or attack it with melee weapons . Like its predecessors , the SD - 4 and SD - 5 models , the SD - 6 series was equipped with data illegally acquired from the Empire ' s Dark Trooper Project , but lacked a heuristic processor . It had a tendency to act single - minded , without being able to think independently . The SD - 6 had an integrated comlink and a blue or red photoreceptor , which allowed for telescopic vision . The battle droid also sported duranium armor , which was as thick as a starship ' s hull in some places and made it virtually immune to the fire of most personal weapons . The SD - 6 functioned as a mobile , intelligent turret , protecting positions or laying down covering fire . The armament allowed the " Hulk " to lay down a barrage of fire , able to fend off both droid and organic infantry assaults . It was most effective against smaller vehicles and large groups of infantry . The droid ' s low speed , however , made it vulnerable to smaller teams of individuals and mobile infantry units , which could dodge the droid ' s arcs of fire . The SD - 6 also worked well in tandem with regular infantry units in offensive and defensive situations , or as a battle droid commander . History . Developed during the last centuries of the Galactic Republic , the " Hulk " saw most of its action deployed by the Old Republic as a defensive unit for vulnerable hangar facilities and landing pads . The units provided cover fire for incoming starships and prevented hostile ships from taking off . During the Clone Wars , the Old Republic withdrew the droids from active duty to avoid confusion with the droid forces of the enemy . During the days of the Galactic Empire , the original duties of the SD - 6 were taken over by smaller and more agile droids , but the SD - 6 was still used by the Imperial armed forces . As the series began to be phased out , many units were either scrapped or sold . Although illegal , some crime lords acquired these war droids to protect their personal starships or act as security forces — alone or supported by other minions . Mercenaries also acquired several SD - 6 war droids . One of them was used by Trandoshan mercenaries during their attempt to take over the repulsortrain " Gem of Alderaan " to capture Senator Bail Prestor Organa . Although also used by the New Republic , the SD - 6 was literally nonexistent during that era , as the SD - 9 and SD - 10 battle droids had been developed to take its place . The few remaining units that had not been melted down were left to their own devices and abandoned .