In 1994 Land Rover created the Defender XD. Powered by 300Tdi engines, the XD has a much stronger chassis, with fibre webbing around the welded joints in the chassis and around stress points to massively increase load capacity. The XD was available both in Defender 90 and 110 forms and known to the British Army as Land Rover Wolves. Usually 110-inch (2,794 mm) Soft or Hard Tops, they are used for patrol, communications and supply duties. 90XDs are less common, but are generally ordered as Soft Top or Hard Top vehicles for light liaison and communications. Short-wheelbase vehicles lack the load capacity needed by modern armies, and the increased power of heavy-lift helicopters has made the larger 110s easily air-transportable- a historic advantage of the smaller, lighter 90.