Enclave Squad Sigma is an elite military unit employed by the Enclave to complete extremely important or secret missions. Sigma is composed of six veteran Enclave soldiers with experience on multiple combat missions, as well as training in numerous forms of fighting. Their leader is unique among the squad for wearing Hellfire power armor and wielding an incinerator. During the Brotherhood of Steel's assault on Adams Air Force Base, Enclave Squad Sigma was assigned to defend the mobile base crawler.
They are initially stationed in their sleeping quarters above the entrance to the Enclave mobile platform but will proceed downstairs once the alarm is triggered to seek and destroy the Lone Wanderer. If they manage to hide from the soldiers, the squad will retire back to their quarters upstairs, except the leader, who wanders idly around the mobile base crawler area.
Interactions with the player character
|This character drops a finger when killed (Lawbringer).|
|This character can be enslaved with the Mesmetron.|
|This character is involved in quests.|
- Who Dares Wins: Should the Lone Wanderer be spotted inside the Enclave mobile crawler, Enclave Squad Sigma will show up and attempt to neutralize them.
|Enclave power armor and helmet
Tesla armor and helmet
Despite being considered special forces, the Sigma members have the exact same equipment, stats, and health as regular Enclave soldiers.
- Fallout 3 Official Game Guide Game of the Year Edition p. 44: "Enclave Sigma
After the destruction of Raven Rock, the Enclave performed a mixture of tactical retreat and all-out flight, and their grip on the Capital Wasteland loosened severely. Now contending with malcontented soldiers, the remains of Enclave Camps dotted throughout the Wasteland with little or no contact or on-going tactical orders, and a lack of new recruits, the Enclave may be a doomed force. However, a small influx of specially trained fighters is seeking to fill the gap left by the Brotherhood of Steel's advances. Posted to previously unknown and highly secretive locations outside of the Capital Wasteland, only the most veteran of Enclave forces trained in multiple forms of combat earn the right to call themselves Sigma. These six-person squads feature a leader clad in Hellfire Armor and carrying an Incinerator, and each man in has seen numerous combat sorties and lived to tell about them. Sigma Squads are posted around locations deemed by Enclave high command as "imperative" to the salvation of the cause, so whenever you encounter Sigma Squads, you know something vital to the Enclave is close by."
(Fallout 3 Official Game Guide faction profiles)