Since 1996, the military variants of the Defender (Land Rover designation: Defender XD – Extra Duty) have been used under the name Wolf (English pronunciation – not to be confused with the Wolf of the Bundeswehr). These are specially revised variants of the Defender TDi. At least 27 equipment variants are known from various contracts. Essentially, these are modified compared to the civilian version: | Classics-World

The 110s and 90s enteredservice in 1985, but it wasn't until 1994 that Land Rover created a dedicated, unique, high spec vehicle, the Defender XD (XD stands for 'xtra duty') which was powered by turbodiesel 300Tdi engines. The wolf, as it became known, had a much stronger chassis, with fibre webbing around the welded joints and other stress points to increase load capacity. Used for supply, communication and patrol duties, the XD was available both as a Defender 90 and 110. (Land Rover The Story