William Roberts was a an officer in Earth Defense Force for more than twenty years. Serving as the executive officer on the UES - Valiant BV-02 and Captain of UES - Aurora CV-01.

Captain Roberts on Aurora its maiden Voyage. Roberts sustained severe injuries after Aurora rammed the Ta'Karan Battleship the Campaglia. After learning that all other senior officers were dead or missing, Roberts order the helmsmen, lieutenant Nathan Scott to assume command of the ship, he passed soon after. William Robert was put to rest at the Walk of Heroes on Aitkenna.