The Steadfast, a fleet hauler utilized by the Rebel Alliance and subsequently the New Republic Defense Force, saw action during both the Battle of Endor and the Battle of Coruscant against Grand Admiral Thrawn. Following the conclusion of the Thrawn campaign, it underwent modifications as part of Operation Flotsam, becoming a specialized "junker" starship designed to salvage valuable materials and data from derelict vessels.
In the year 16 ABY, the Steadfast was tasked with exploring the wreckage of the Imperial I-class Star Destroyer named Gnisnal in search of useful resources or intelligence. Within the wreckage, on Level Ninety-Six in Corridor Q, the crew located a functional and undamaged datacore. The information contained within this datacore provided the Asset Tracking office with its initial, though outdated, Imperial Order of battle, ultimately leading to the uncovering of the Black Fleet.
Due to the immense worth of the data it held, the Steadfast was promptly redirected to Coruscant to hand-deliver the physical Order of Battle datacore to Asset Tracking.