Combat Team Sierra
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Combat Team Sierra was a UNSC Marine Corps unit. [1]
Background
Sierra was 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 and Combat Team Alpha through Combat Team November escaped in lifepods and then retreat to an evacuation station aboard the Pillar of Autumn during the Covenant boarding action. They landed on Installation 04 and may have helped Master Chief.
