Trigger was a group of CR90 corvettes used by the Galactic Empire. Trigger 3 and Trigger 7 were guarding a secret Imperial research outpost, which was trying to duplicate the Shield X that was used in Operation Ram's Head, when the facility was then attacked by an X-wing, A-wing, Y-wing and B-wing, the last of which was piloted by Keyan Farlander. Both corvettes were destroyed.