Powered armour is nothing new to military engineers, and the first designs entered service as early as the mid- to late-21st Century. Over the next five centuries, however, the concept has undergone some radical shifts in design philosophy, has been abandoned, readopted, and abandoned again, various declared impractical or revolutionary, and was finally adopted by the UNSC Navy as cursory experiments in combat exoskeletons. Though it was by no means the only project to investigate these concepts, the MJOLNIR Project of 2512 was the best known of these projects, and after being adopted by Doctor Catherine Elizabeth Halsey it would become the most recognisable and successful powered armour projects of all time. Numerous technologies initially developed for MJOLNIR would enter service in othe