Horton Salm was a Human male from the planet Norval II in the Calaron sector of the Outer Rim Territories who was a military officer of the Alliance of Nations. An accomplished pilot, leader, and training commander, he preferred to fly Koensayr Manufacturing BTL Y-wing starfighters over newer models, as he felt that the older craft were more reliable and would get him home in one piece. Salm led the Alliance's Gray Squadron at the Great Battle of Endor, surviving the run through the second Death Star's superstructure. Salm continued to command combat units, leading Aggressor Wing through the Battle of Lassus nine months after Endor, an engagement that saw him promoted to the rank of general. Salm later led the Aggressors during the evacuation of Agatheson V.