Stellar Legionnaire represented the entry-level position within the Sun Guard of Thyrsus. Those holding this rank, Legionnaires, were subject to a one-year probationary period, during which infractions of Sun Guard protocol could lead to dismissal. Successful completion of this probationary period resulted in advancement to the rank of Stellar Tribune.
Daniel Wallace, when developing the Sun Guard's rank structure for Galaxy at War, opted for nomenclature that evoked the spirit of the Roman Empire.