http://www.military-today.com/engineering/crarrv.htm The Challenger Armored Repair and Recovery Vehicle (CRARRV) was developed in the mid 80s. In 1985 the UK MoD signed a contract with Vickers Defence Systems to build 30 armored recovery vehicles to support the Challenger 1 main battle tank. A total of 74 ARVs were delivered to the British Army. More information on Military-Today.com website.