The Cyborg is a heavy infantry unit in used by the Brotherhood of Nod and CABAL during the Second Tiberium War and the Firestorm Crisis.
The Cyborg stands approximately 8 feet tall, towering over regular Light infantry or Disk throwers. It is armed with a small pulse gatling gun with a very rapid rate of fire as well as a grenade launcher built into its right arm (although the latter is not used ingame). The heavy armour mounted on the cyborg gives it considerable protection against small arms fire, allowing it to mercilessly mow down waves of enemy light infantry. Cyborgs that show themselves to be formidable in the field are promoted to the cyborg commando ranks, where they are outfitted with even more powerful and fearsome weaponry (albeit with the same sluggish aiming system). Every cyborg design utillized backup control device that will keep cyborg to be obedient to its master. This was set as a countermeasure against any semblance of rejection, desire for humanity, or in cases of "uncontent" candidates. Nod allocated the cyborg control system, which turned out to be a wrong decision, as CABAL went rogue at the beginning of the Firestorm Crisis, shortly after Anton Slavik had reactivated it.
Cyborgs are the result of Project ReGenesis cybernetics research, essentially a human infused with Tiberium and encased in heavy assault armour with cybernetic prosthetic limbs and head implants.
During his revolt, CABAL stole all batallions of cyborgs from the Brotherhood, but had to rely on them as his main unit. Cyborgs were used as primary attack units against enemy bases, raiders, ambushers, and even as main-line units. It should be noted that the cyborg's lack of effective offense against buildings and heavy vehicles prevented CABAL from making effective use of certain tactics. To compensate, the rogue AI massed them in large numbers.
Nod was forced to replace these units by using an Elite Cadre of the Black Hand forces.
After the conflict, regular Nod forces ceased using cyborg units and many where either destroyed or decommissioned. The events with CABAL led the Brotherhood to shy away from cybernetics. By the Third Tiberium War, Black Hand troopers replaced the Cyborg's role as heavy infantry. However, the Marked of Kane were formed after the war, introducing more advanced cyborgs - the Awakened, the Enlightened and the Tiberium troopers.
The Cyborgs' SHP file contains two unused death animations that show them exploding in a pool of blood, much like the rest of Tiberian Sun infantry, which would imply that they were not completely cybernetic by nature. In contrast to this, the Cyborg commandos just stand in an electro-magnetic pulse.
The manner in which Cyborgs lose their legs when heavily damaged could be a reference to the 1984 film The Terminator, in which the titular cyborg also loses both of its legs and is forced to crawl on it's stomach in order to remain mobile.