Challenger 3 is simply a deep modernization of the Challenger 2 tank developed within the RBSL consortium (Rheinmetall BAE Systems Land) by the German company Rheinmetall and BAE Systems, which has intellectual property rights to Challenger 2. As part of the modernization, the old tower with cast shell, on which the peculiar Dorchester armour was applied, was replaced by a fresh structure made by welding of steel panels.