Unggoy Ultra

Ultra Grunt is a Covenant Unggoy (Grunt) rank.

Rank
The Ultra Grunt is the highest Grunt rank seen so far in the Covenant military. Like Ultra Elites, Ultra Grunts wear distinct white armor.

Ultra Grunts can sometimes be seen commanding lower classes of Grunts in battle, even leading black-armored Special Operations Grunts into combat.

Unlike Ultra Elites, Ultra Grunts do appear to have minor of impunity with command. It is just as likely that two or three will be encountered, yet the Elites are ultimately in command. They only have authority over minor races in the Covenant, fellow Grunts, Jackals, and Drones.

They tend to fart a lot.

Combat
Ultra Grunts usually tend to throw more grenades and fire more accurately than the lower ranked Major and Minor Grunts. They are usually seen with Needlers or Plasma Pistols. They can also take almost the same amount of damage Spec Ops  Grunt, although they are still vulnerable to headshots (even though it may take more then one).

Background
The purpose of this rank designation has been generally unclear. They were first mentioned in Halo: First Strike, pushing carts of cleaning fluid and implying that they were even lower than Grunt Minors. However, they were also seen inside the Scarab walker in New Mombasa along with high ranking Elites (Minor, Major, Ultra, Zealot). They were also seen throughout New Mombasa and Delta Halo. This led some to believe that they were "technicians" or engineers (Not to be confused with the Engineer species) of some sort, but the production book, The Art of Halo, Confirms that they outrank Major Grunts. It has, however, been suggested that white armor actually signifies menial labor, while the more silvery armor means Ultra. Still, there is not a sufficient color difference to make this a significant case.

Appearances
These Grunts are exclusively seen in Halo: First Strike and physically in Halo 2. They are seen throughout Halo 2, but are far more frequent in the Heroic or Legendary difficulty levels than the Easy or Normal ones.

Halo: First Strike

 * Unyielding Heirophant - Two Ultra Grunts were seen pushing carts of cleaning fluid.

Halo 2

 * Cairo Station (Heroic and Legendary only) - Seen throughout the level, most noticeable are in the hangars, but also in the commons areas.
 * Outskirts Ultra Grunts attacked SPARTAN-117's position in the building near the Pelican crash site.
 * Metropolis - Several Ultra Grunts were present on the Scarab command deck, possibly even manning the walker.
 * The Oracle - An Ultra Grunt is dropped to help you with some other SpecOps forces at the exit of the Flood labs.
 * Uprising - If you are lucky, the Grunt assisting you in the Turret will be an Ultra. This is very rare, though. On Heroic and Legendary, two Ultra Grunts are present near this turret.
 * High Charity - At the beginning of the level, and a few more times throughout the whole thing fighting Flood.