Alpha Base (Installation 09)

Alpha Base was a UNSC firebase established on Installation 04C by Marine forces of the during their battle against a Covenant splinter group known as the Banished.

Shortly after the Halo ring's deployment from the Ark's Foundry, UNSC forces led by Spartan Jerome-092 established Alpha Base near Installation 04C's control room. Using one of the Ark's access point teleporters, Banished forces began flowing onto the ring and slowly overwhelmed the human contingent on the installation. However, the portal was soon destroyed by UNSC forces on the Ark's surface, halting the flow of Banished reinforcements and allowing the UNSC to secure Alpha Base. Moments later, a Retriever Sentinel attacked the base but was eventually taken control of by Professor Ellen Anders after UNSC forces secured three Control Towers in the area.

List of appearances

 * Halo Wars 2