Jiralhanae Captain Ultra

The Captain Ultra is the second highest attainable rank a Brute can achieve, next to Chieftain, and wear cyan Power Armor, which signifies higher rank then the gold Brute Captain Majors.

Rank Differences
Some think that all three Brute Captain Ranks are equal, but that is not true. Others mistake which color signifies which rank. As stated on Bungie Player Stats, the Captain Regulars have violet power armor, Captain Majors have gold power armor, and Captain Ultras have light cobalt armor as shown above.

In Combat
Captain Ultras are very strong; it can take multiple hits from any non-explosive weapon to kill them. Though the best weapon(non-explosive) for these brutes is the Battle rifle, a few shots to the head is a gauranteed kill. However, the Spartan Laser and grenade sticks will still usually kill them in one hit. A single Plasma Grenade can kill them. If it does not, aim for the head. Ultras are rare in lower difficulties but more common on Heroic and Legendary. They are generally seen leading lesser Brutes and Grunts in battle. The cyan color can be mistaken for a Brute Bodyguard's, which is light cobalt in color.One more tactic would to just melee in heroic and below.

Captain Ranking System

 * Captain Ultra (Highest)
 * Captain Major
 * Captain Regular (Lowest)