Kallum was a male Advozse lieutenant of Galactic Republic during the Galactic War between the Republic and the resurgent Sith Empire. During the Battle of Corellia in 3641 BBY, Lieutenant Kallum and his squad attempted to put out the fires and remove the detonite charges from starship torpedoes in Labor Valley. Attacked by enemy droids, the squad members were all killed, with Kallum the only remaining survivor. He made it back to the nearest medical station and asked a Republic citizen to finish the job.