Canon

UNSC Monitoring Station Delta Five

From Halopedia, the Halo wiki

"Cleo. Overseer, UNSC Monitoring Station Delta Five, Pluto. I am with Cortana."
— Cleo declares his allegiance.[1]

UNSC Monitoring Station Delta Five is a United Nations Space Command facility located on or in orbit of 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.[1]

The station is presumably one of the several installations said to orbit the dwarf planet (alongside the remote scanning outpost Democritus and the Kelvin Research Station).[2][3]

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