Alpha Headquarters

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 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. It was set up near Cote D'Azur so that the Marines, under 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 Wraith tanks, Banshee fliers, and thousands of Grunts. The Marines were able to hold them off, but at heavy cost. Almost the entire base was destroyed, and only ten marines survived the incident. When a single Warthog with Corporal Harland arrived, he assumed tactical command of the entire ground operation. He was quickly relieved by a team of Spartans.

The Spartans landed their 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 device, and along with the surviving marines and civilians, were evacuated and docked with the UNSC Leviathan for a return to Reach.