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The first Battlesuits were used by the Tau T'au during the [[First Sphere of Expansion]], where they were then known as the T-Series, helping to capture [[Tash'var]] in 576.[[M39]]{{Fn|8b}}. The fossil-fuel powered T-Series was quickly replaced by the V-Series, which used Fission Reactors. However radiation poisoning for pilots was still problematic and it was not until later that they became standard in Tau T'au [[Cadre]]s. The current X-series of Battlesuits are far more advanced than their predecessors, and are considered the elite tip of the spear of the Tau T'au Empire.{{Fn|8a}}