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• The Insurrection of Mamore takes place on Mamore, resulting in the insurrectionist forces being put down by the Spartan-III Alpha Company.
• The Battle of New Constantinople is fought.
• The Battle of Leonis Minoris ends in a Covenant victory as the Leonis Minoris colonies are glassed.
• Heavy conflict takes place in the Bonanza Asteroid Belt, distinguishing the Spartan-III Alpha Company.
• Operation: PROMETHEUS. Most of Spartan-III Alpha Company destroys a Covenant shipyard on asteroid K7-49, but all of the participating Spartans are killed in the process.
• Beta Company of the Spartan-III's is authorized.
• The 2nd class of Spartan-IIs are conscripted. One of them is Yasmine Zaman.