ISD's are constructed by Kuat Drive Yards and hold a distinguished place in the Imperial Navy, containing more than 2500 vessels. At lengths 1600 meters long it's weight is overwhelming for normal class airspeeds, and uses hypergenerators to blast it in it's current speed rates. Imperial Star Destroyer is most notable for its massive size and overwhelming firepower; a single Imperial-class ship is capable of overwhelming most starships or devastating a hostile planet, and its mere presence is often enough to deter rebellion. At 1,600 meters long, Imperial-class Star Destroyers are armed with turbolasers, ion cannons and tractor beam projectors. They carry 72 TIE fighters, numerous ground forces (including stormtroopers, 20 AT-ATs and 30 AT-STs), a prefabricated base for rapid deployment to planetary surfaces and a variety of support and landing craft Following the climactic Battle of Endor, the Rebel Alliance captured several Imperial-class ships and added them to their own fleet.