Rojahn was a Human individual of male designation. He held a position in the Imperial Navy throughout the Galactic Civil War.
Rojahn held the rank of commander on the Carrack-class light cruiser known as the Expeditious. He operated as a component of Admiral Devlia's naval forces within the Rachuk sector. During his tenure, the Expeditious, under his leadership, successfully apprehended Gil Bastra, a one-time officer of CorSec. Furthermore, the ship accommodated Imperial Intelligence operative Kirtan Loor when Loor boarded the vessel to question the captured Bastra. Loor was present on the Expeditious when it and the Lancer-class frigate Ravager stumbled upon the assault led by Rogue Squadron on Devlia's installation at Grand Isle. Following the annihilation of the Ravager, Rojahn requested authorization from Loor to collect any escape pods before withdrawing, citing his unequivocal instructions to transport Loor to Coruscant with the utmost haste. Seeking to maintain Rojahn's allegiance, Loor consented to this request.