Commissioned by the Joint Chiefs of Staff, the development of the X-01 began shortly before the Great War. It represented a radically new approach to designing powered armor, eschewing traditional design philosophies that defined the T series, and was a high-profile research project meant to supersede previous power armor models. However, although the suit was technically functional by late 2077, it was burdened with numerous issues that precluded widespread use in the field. A single suit of X-01 was provided to the Nuka-Cola Corporation, as part of Project Cobalt. While the suit served as a successful proof of concept of using a strontium-90 based plating over the armor, this improvement was not adopted into the armor's schematics before the onset of the Great War. Further development was made impossible due to the outbreak of the Great War.
