Combat Team Alpha
From Halopedia, the Halo wiki
Combat Team Alpha was a United Nations Space Command Marine unit stationed aboard the UNSC Pillar of Autumn in 2552. In 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.
