"Alpha" was stationed aboard the UNSC Pillar of Autumn in 2552. During the abandonment of the warship, it was to hold off the invaders until all non-bridge operations personnel escaped in lifepods and then retreat to an evacuation station aboard the Pillar of Autumn during the Covenant boarding action. Combat Team Sierra through Combat Team Victor evacuated after them.
- The player helps this team in the Cafeteria.
- If you kill Captain Keyes on the bridge on the level Pillar of Autumn, the 'Unkillable' Alpha Team will come to kill you while trapping you in the bridge and leaving you no choice but to die.