Enclave Squad Sigma

 is a special unit of Enclave Soldiers which are added to Fallout 3 in the Broken Steel add-on. The Sigma Squad is assigned to protect the Mobile Base Crawler in case of an attack, which happens when the Lone Wanderer infiltrates the base. The squad consists of approximately 5-6 soldiers using different types of specialties, led by the Enclave Sigma Leader. After (and if) an alarm sounds in the Mobile Base Crawler, the squad arrives and immediately attacks the Lone Wanderer.

Strategies
The entire squad is clumped together when breaking through the door, and therefore can be easily dispatched with a single nuka grenade, with the possible exception of the leader. The Tesla Cannon is also a good weapon to take them down quickly. There is a chance that one of the squad members will be carrying an alien blaster pistol.

Appearances
appears in the Fallout 3 add-on Broken Steel.