Thales is a natural satellite with volatile conditions. The United Nations Space Command established a presence of sorts on the moon shortly after 2553. Though the vessel was traveling to Installation 00, the public believed UNSC Rubicon was prototype testing in an Oort cloud near Thales. The Engineer variant of the MJOLNIR Powered Assault Armor, as well as the Contoured forearm guards, were first deployed during the Thales Expedition. The Engineer variant was used on Thales to halt the criminal activity in the colony's docking complexes.