Installation 04 (Earth-8756)

"Whoever controls Halo controls the fate of the universe."

- Captain Jacob Keyes

Installation 04, also known as Alpha Halo, or simply Halo, was one of seven ring-shaped superweapons that were part of the forerunners' Halo Array. Located in the Soell system, in the Orion Arm, it was the closest Halo to the human sphere.