Stealth Sangheili

The Stealth Elites is a Sangheili (Elite) rank of the Covenant and later the Covenant Separatists.

Roles
These Sangheili Stealth soldiers are the assassins of the Covenant Army Special Warfare Group. They also share a similar role to that of the Sangheili of the Special Operations units.

The use of their active camouflage makes them experts at ambushing enemies in tight quarters. They are usually equipped with Energy Swords or Plasma Rifles and seen commanding Grunts equipped with active camouflage.

While they possess Active Camouflage, their defensive capabilities are lower than those of other Elites due to the weakness of their personal energy shields.

Armour and Shields
These Sangheili are clad in armor that comes in several different variations. They are a specialty class, like Rangers, and are suited for stealth operations.

During and prior to the Battle of Installation 04, their armor was a light blue or Grey color, depending on the lighting, and has a Forerunner emblem on the back. However, this armor system did not allow for use of a Sangheili Personal Energy Shield.

During the First Battle of Earth and the Battle of Installation 05, these Stealth soldiers received updated and improved armor. The color was changed from a gray-ish tone to either a brown or silver/steel color. In addition, the designers added in personal energy shields for increased survivability. On the downside, these shields are only equal to that worn and used by Sangheili Minors, if not weaker, though they recharge faster than any other armor system worn by the Sangheili.

Combat
Stealth soldiers are normally armed with Plasma Rifles, either single-wielded or dual-wielded. Frequently, these soldiers are allowed to carry and use Energy Swords. They often lie in wait in order to ambush their enemies. They are also far less prone to tactical mistakes, such as not charging directly into a fight and taking cover more often. Their agility and Active Camouflage make them difficult targets to hit. They often attack in pairs, much like Hunters.

The best way to combat a Stealth soldier in Halo: Combat Evolved would be to take advantage of their lack of shields. The M6D Pistol and the SRS99C-S2 AM Sniper Rifle will kill them with a single shot to the head, though it can be difficult to land shots due to the Sangheili's agility and camouflage ability. The sniper rifle night vision makes this easier because it makes them quite visible. The MA5B is very effective at close range, as it's ability to fill the air with a large number of projectiles reduces the need for accurate aiming and allows you to find the Sangheili easier while they are still camouflaged. Explosives are also extremely effective when trying to flush them out of hiding or from behind cover, or to damage them.

In Halo 2, head shot-capable weapons such as the SRS99C-S2 AMB Sniper Rifle, M6C Magnum Sidearm, BR55 Battle Rifle, or the Covenant Carbine. Their relatively weak shields can be broken easily by these weapons, and like any other Sangheili soldier, they can be killed by a single headshot while unshielded. Marksman weapons such as the Sniper Rifle can kill them with a single headshot even when fully-shielded depending on difficulty playing on. The shotgun is very effective when combating a Stealth Elite in a close quarter’s environment.

Stealth Elites appear frequently in the Halo 2 campaign and mainly the level Outskirts on Legendary.

Halo Wars
In a Halo Wars trailer Stealth Elites attack a Marine squad called Blue 5. The last two survivors of Blue 5 tried to escape, but both were shot in the back by plasma bolts, presumably from a Plasma rifle. One of the two Marines survived and began to crawl away from the Elites, but one of the Sangheili warriors stabbed him with his energy sword. He than picked up the Marines dead body, growled, and tossed it away. When Marine team Blue 6, armed with Scorpion Tanks, Warthogs and Battle Rifles, got to the Stealth Elites' position, Blue 5 was already dead. A huge battle broke out. The trailer ended with the leader of SPARTAN Group Omega saying "If they want war, we'll give 'em war!"

Trivia

 * The silver colored Stealth armor systems have shields that are slightly weaker than those of the brown armored systems. This could possibly mean that the silver-armored ones are Stealth Minors and the brown-armored ones are Stealth Majors.
 * In the programing of Halo: Combat Evolved it shows Stealth Sangheili subdivided into Minors and Majors in the levels which they occur in.
 * In Halo 3, instead of fighting Sangheili Stealth specialists, you fight Jiralhanae Stalkers which nearly have the same role as their Sangheili counterparts except for the fact that the Stalkers protect their pack's Chieftain.
 * The Sangheili of this expertise do not appear during the events of Halo 3, though it is still possible that some of these soldiers still fought during the Second Battle of Earth and the Battle of Installation 00. It's also possible that some of these Sangheili were absorbed into the Covenant Separatist Special Operations groups during the Great Schism.
 * In the last level of Halo: Combat Evolved, The Maw, there are some Combat Forms with their Active Camouflage still working. This means that they are likely infected Stealth Elites. However, they do not carry weapons.
 * Stealth Elites are not to be confused with Ossoonas, who also employ the active camouflage. Ossoonas are supposed to spy on the enemy without participating in the fight unless spotted, while Stealth Elites are for combat purposes.
 * Stealth Elites mainly show up in Halo: Combat Evolved, but some Stealth Elites are seen in Halo 2, and are then replaced by Brute Stalkers in Halo 3.
 * In Halo Wars, these units are equipped with dual Energy Swords and an Active Cloaking Device. Their role is primarily as an anti-infantry unit.
 * Stealth Elites are not the only Elites that can use Active Camouflage. They are the only ones who have the dedicated role of attacking by stealth in a combat situation so they are trained specifically for it.