CoSof was a group of two Sullustan transports during the Galactic Civil War. During the diplomatic meeting between the Sullustans and the Rebel Alliance near Sullust during Operation Strike Fear they carried Sullustan diplomats and were boarded by the Rebel transport group Tector in order to receive the abducted Sullustan technicians, just rescued by the Alliance. The meeting was interrupted by the arrival of the Imperial-class Star Destroyer Invincible. Hamo Blastwell and Keyan Farlander, flying R-22 Spearheads, held off the Imperial fighters until the meeting was concluded and all ships fled into hyperspace.