Kallum, a male lieutenant of the Advozse species, served the Galactic Republic in the Galactic War. This conflict pitted the Republic against the reconstituted Sith Empire. In 3640 BBY, during the Battle of Corellia, Lieutenant Kallum and his squad were tasked with extinguishing fires and disarming detonite charges from starship torpedoes located in the [Labor Valley]. The mission took a turn when enemy droids ambushed them, resulting in the deaths of all squad members except Kallum. Managing to reach a nearby medical facility, he implored a Republic-aligned person to complete their original objective.