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Combat Team Sierra was a UNSC Marine Corps unit. [1]
Background
Combat Team Sierra was stationed aboard the UNSC Pillar of Autumn in 2552. During the abandonment of the warship to the Covenant bombardment and boarding, the team's aim and objective was to hold off the invaders until all non-bridge operations personnel and Combat Teams Alpha through November escaped in the lifeboats, and subsequently, fall back to an evacuation station aboard the Pillar of Autumn. They landed on Installation 04 and may have helped Master Chief find his way through the surrounding Forerunner structures.