- Wolverfrog
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- Fabled Legendary Member
It's a prequel to Halo CE, most likely set a week or so before it, perhaps running into it too.
Reach was a human planet; you could argue the most important too. The Office of Naval Intelligence was based there; as was most of the weaponry and new technology.
Project ORION, what you might call the Spartan Project was also based there, every Spartan ever made was bred for war there; actually, that's wrong, Spartan IIIs were trained on Onyx, but that's a different story.
Read Fall of Reach and First Strike for more information.