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 * The Forerunners were an ancient race of enlightened beings whose empire encompassed three million fertile worlds in the Milky Way Galaxy approximately 100,000 years ago. The Forerunners were the creators and builders of many significant installations, including the Halo Array, the Ark, and the shield worlds. The alien faction known as the Covenant worshiped the Forerunners as gods. Read more...
 * The United Nations Space Command is the UEG's primary military, exploratory, and scientific arm. The military arm, known as the UNSC Defense Force, is intended to protect innocent colonists and colony worlds from attack by privateers, Insurrectionists and other threats, such as the Covenant. Read more...
 * The Covenant was a religious hegemony of multiple alien species that controlled a large portion of the Orion Arm in the Milky Way Galaxy. They waged a genocidal campaign against humanity until they were defeated due to many factors, the most crucial of which was an internal conflict. Read more...
 * The Flood are a species of highly virulent parasitic organisms that reproduce and grow by consuming sentient life forms of sufficient biomass and cognitive capability. They are widely considered to be the greatest threat to the existence of life, or, more accurately, biodiversity, in the Milky Way galaxy. Read more...

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Best to keep this limited to only the primary factions; note, ONI is not primary.[citation needed]