This Sienar Fleet Systems design was derived from the Lambda-class shuttle, retaining the Lambda's triple-wing design. As with the Lambda, the Sentinel's two lower wings fold during landing. The Sentinel differs from the Lambda in terms of cargo space and weapons. There are eight retractable laser cannons mounted on the hull, two concussion missile launchers, a retractable ion cannon, and a pair of retractable repeating blaster cannons mounted beneath the cockpit. Using a weapons system with retractable mounts means the Sentinel-class shuttle is sleek and aerodynamic when swift transport is needed, but it can hold its own in a fight. The Sentinel also has enhanced armor plating for defense. The 20-meter-long central section of the Sentinel is widened and elongated to allow for the transport of up to 54 soldiers and six speeder bikes, and drives the length of the craft to 20 meters. The Sentinel-class was introduced after the Battle of Yavin, but never became widely used in the Imperial fleet. Following the Battle of Endor, SFS allowed Cygnus SpaceWorks to build their own version of the Sentinel, and the craft became available to private, pro-Imperial concerns. In this way, it also found its way into New Republic fleets via front companies.