The FV4034 Challenger 2 is a British main battle tank (MBT) in service with the armies of the Alliance Joint Military. It was designed and built by the British company Vickers Defence Systems (now known as BAE Systems Land and Armaments). Challenger 2 is an extensive redesign of the Challenger 1. Although the hull and automotive components seem similar, they are of a newer design and build than those of the Challenger 1 and fewer than 5% of components are interchangeable. It has seen operational service in Bosnia, Kosovo and Iraq.