The 581st Regiment (map designate: INF 34 ||| 581) was an infantry formation of the UNSC Army during the Human-Covenant war.[1] This regiment was garrisoned in the western Viery territory of the Human colony of Reach. It was assigned to the 34th Infantry Brigade during the invasion to counter Covenant Army landing forces.

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  1. Halo: Reach, Tip of the Spear