Alpha Headquarters was the name of the lead firebase set up by the UNSC Marines on planet Sigma Octanus IV, grid 19 x 37, during the Battle of Sigma Octanus IV in July 17, 2552. It was guarded by bunkers, armed checkpoints, guardhouses, and sandbags. It contained a main barracks, a command office, and a munitions bunker. It also had a main hospital.
During the Battle of Sigma Octanus IV, Alpha Headquarters was set up near Côte d'Azur so that the Marines, under the command of General Kits, could assault the city, which had been captured by the Covenant.
The base was staffed by 400 Marines when it came under assault by the Covenant forces. They attacked with Type-26 Wraith tanks, Type-26 Banshee fliers, and thousands of Unggoy. The Marines were able to hold them off, but at a heavy cost: almost the entire base was destroyed, and only ten Marines survived the incident. When a single M12 Chaingun Warthog with Corporal Harland arrived, he assumed tactical command of the entire ground operation. He was quickly relieved by a team of SPARTAN-IIs.
The Spartans landed their D77-TC Pelican in the base and used it as a staging area. They successfully killed all the Covenant soldiers in the area with a HAVOK tactical nuclear weapon, destroying Cote d'Azur and the remains of Alpha Headquarters consequently.
Corporal Harland's fireteam arrive at Alpha Headquarters.
List of appearances
- Halo: The Fall of Reach, pages 171-175
- Halo: The Fall of Reach, page 172
- Halo: The Fall of Reach, page 160
- Halo: The Fall of Reach, pages 171-172
- Halo: The Fall of Reach, page 175
- Halo: The Fall of Reach, page 174
- Halo: The Fall of Reach, page 211