Corrupted Marine/Xeno Parasite.



Corrupted Marines are N.O.V.A. marines that have been infected by the Xeno parasite. The parasite taps into the man's nerves and mind and controls what they think, do and say.

The Xenos sent a full scale invasion with the parasites to the mining facility on New Ceres. Most of the marines infected were killed by Kal Wardin in the mission, The Mirror, the Ghost, and the Gambit. Some were also on the Xeno's main city.

In combat the marines behave much like Kal Wardin, using sniper rifles, and other earth weapons. The parasite glows when attatched to a host.

In N.O.V.A. 3, multiple times in multiple places corrupted marines are referred to as Volterites. There are no other hostile Xenos after the invasion, with the exception of in the Judger ruin on Scorpius, where there are Heavy Demons and corrupted marines (N.O.V.A. 2). These likely travel from portals directly from the Judger Citadel as reserve troops to defend the building of their Judger masters. Hence, they attack the Human-Volterite Alliance troops (and Kal Wardin) infiltrating the ruin.

Those in N.O.V.A. 3 join the Volterites, seeing as, like the Xenos, the Volterites are "merely tools" of the Judgers, as stated by the first Volterite Overseer. It's unlikely they did this of their own accord, seeing as, as Prometheus states in N.O.V.A., their intelligence is lacking. More likely they were sent by the Judgers to keep an eye on the Volterites. In the N.O.V.A. 3, the corrupted marines also appear to have armor different to N.O.V.A. marines, unlike the previous two games.

Trivia
The Dominion is the main antagonist faction from N.O.V.A  3. It was formed when the N.O.V.A government gave the Volterites control over their government.
 * In N.O.V.A.3 they can use their parasite's tentacles to type on a keyboard, as seen in the levels in the Lost Ark.
 * In N.O.V.A 3 they bear resemblence to Flood Infected forms from Halo.
 * They are the only enemy that appears in every game.

Human Volterite Alliance
Before it officially became the Dominion, the faction was known as the Human-Volterite Alliance. It was formed when the Volterites made contact with humanity.