- JobeTheConqueror
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- Exalted Legendary Member
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A logical assumption would be that Halo: Reach takes place just after the Pillar of Autumn flees from Reach with it's random slipspace jump (or it's possible this happens during the Halo: Reach campaign). When it exits this jump, it ends up at Halo, due to Cortana's experimenting with coordinates she found in Covenant intel.
So, Reach takes place at the same time as Halo CE. Likely the same week as the Slipspace jump they made was not a long one.
That said, it is very possible the Spartans on Reach have some other advanced weaponry in addition to the usual UNSC and Covenant arsenal. This is because on Reach, Oni has it's secret CASTLE facility located in the mountain base many of the Spartans on Reach fall back to when the assault kicks into full swing. In this facility they did work on new weaponry. Some Spartans are presented with experimental weapons (Like the BR) by Doctor Halsey when they meet up with her at the base. It's very possible that they come across and use other weapons that were in development.