Canon

UNSC Monitoring Station Delta Five

"Cleo. Overseer, UNSC Monitoring Station Delta Five, Pluto. I am with Cortana."
— Cleo declares his allegiance.

UNSC Monitoring Station Delta Five is a United Nations Space Command facility orbiting[1] the dwarf planet, Pluto, in the Sol system. In October 2558, the station's overseer, a smart AI known as Cleo, defected to the Created.[2]

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