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The Halo array is 12 ring worlds, currently 7 ring worlds. They were used to kill off sentient life in the Milky Way, to starve the Flood. They also had samples of species so the Forerunners could reseed the galaxy after the rings fired.
Installations 01, 02, 03, 06, 07, 08, 09, 010, 011, 012, and Greater Ark.Edit
Information unknown. Some destroyed.
Heavily damaged, casualties: Weather controls. Destroyed Installation 04B. See Battle of the Ark.