Omicron 1 & 2 were a pair of Rebel Alliance Beta-class ETR-3 escort transports colluding with the Airam pirates at a Goff Platform in the Goff system. Omicron 1 was crewed by ordinary Alliance personnel, however Omicron 2 carried officers. During the attack by the Imperial forces of Task Force Vengeance, the ETRs of Omicron group concentrated their counterattack on the Interdictor Compellor.