two new vehicles splitting the AVRE role: the Chieftain Armoured Engineering Vehicle (Gun) and Chieftain Armoured Engineering Vehicle (Winch). Both were to be multi-role vehicles capable of more than just the AVRE function. Chieftain AEV (Gun) was to be fitted with a demolition gun, but was cancelled early in the design process due to budget constraints. Chieftain AEV (Winch) continued in development and design evolved into the Chieftain ARV and two prototype gunless FV4203 Chieftain AVRE vehicles built in the early 1970s. FV4203 AVRE vehicles were almost identical to the Chieftain ARV, also based on the AEV (Winch), but added a dozer blade/bucket, deployable bridge, and the ability to launch a roadway. The project was cancelled in favour of completing normal engineering operations with the lightly armoured Combat Engineer Tractor (CET) while retaining the Centurion AVRE in frontline service. The FV4203 AVRE prototypes were later converted for Armoured Repair and Recovery Vehicle (ARRV) trials. Chieftain "CHAVRE" AVRE With the introduction of Challenger 1, the Centurion AVRE was struggling to keep up, while military requirements needed a larger number of trackways to be carried. Surplus Chieftain vehicles could have the turret removed to reduce the vehicle weight, providing enhanced mobility even when loaded with engineering stores. Removal of the turret would also allow six Class 60 trackways or three fascines to be carried on top of the vehicle. The Chieftain tank based "Willich Chieftain AVRE" entered service in 1987. This vehicle was designed by Capt D Clegg MBE RE. Twelve vehicles were built by 32 Armoured Engineer Regiment and 21 Engineer Base Workshop of the Royal Engineers under the direction of Lt Col JF Johnson RE based in the German town of Willich, hence its name. Some of these vehicles saw use in the First Gulf War. In 1989 a programme was launched to convert a further 48 vehicles with prototypes arriving in 1991. The Chieftain "CHAVRE" AVRE entered service in 1994. 48 units were produced by Vickers Defence Systems. The "CHAVRE" nomenclature mirrored that of the Chieftain ARRV "CHARRV" as distinguished from the Challenger ARRV "CRARRV". Each CHAVRE provided a 10 tonne winch and Atlas crane for engineering operations, along with a trackway on top for multiple fascines or stores. It also fitted a dozer blade or mine plough. With no primary armament, CHAVRE was initially used alongside the Centurion AVRE. Trojan AVRE functions have been combined with others into