the remaining 149 were new production tanks. The order has been completed, the first being delivered in July 1981. FV4030/3 Shir 2 Also known as "'4030 Phase 3'" Iranian variant. The Shir 2 represented a completely new-MBT incorporating Chobham armour (renamed "Pageant" to avoid diplomatic incident with the US government) to the hull and turret, with the rear of the hull similar in design to the Shir 1. The fire control, gun control and automotive systems were the same as Shir 1 with the following exceptions: Automotive - the option of adopting hydrogas suspension and command & control, the new No 84 commander's (PPE) day/night sight. The project began in 1974 and the first vehicle ran in October 1978. The production order was for 1,200 MBTs and production release given for 250 before cancellation in February 1979. Not delivered, the Shir 2 tanks became FV4030/4 Challenger 1 tanks after reworking at ROF Leeds. Mobarez TankIranian upgraded version of Chieftain. : Chieftain/ T95 Development of the FV4201 Chieftain allowed for the interchangeability of guns with the U.S. T95 tank by means of exchanging turrets. The project was discontinued because of numerous problems with training crews to master two artillery systems. Equipped with a 90mm T208 (rifled) gun. FV4211 Test vehicle using Chieftain automotive sub systems (including the L60 engine), embodied in a new aluminium hull and turret structure incorporating Chobham Armour (CA) for the first time. The project began in October 1969. A feasibility study was completed by February 1970 which led to MVEE being asked to design and produce a prototype within a year. This timescale was achieved, the MVEE produced the first prototype in February 1971. Although the project was officially discontinued in 1972, research work within MVEE continued until 1974. A paper study on a Mk. 2 version was carried out and was considered during the FMBT (Future Main Battle Tank) studies in 1974. FV4204 ARV/ARRV Armoured Recovery Vehicle, Armoured Recovery and Repair Vehicle. FV4205 AVLB Mk5 Bridge-laying vehicle Chieftain AVRE (CHAVRE) Armoured Vehicle Royal Engineers, twelve early "Willich Chieftain AVRE" vehicles converted by 32 Armoured Engineer Regiment and 21 Engineer Base Workshop of the Royal Engineers, Willich, 1987, remaining 48 ex MBTs converted by Vickers Defence Ltd, 1991, to be a British Army combat engineering variant used by the Royal Engineers. Chieftain Fascine Layer Four turret-less vehicles specially converted for laying fascines Chieftain MarksmanSelf-propelled anti-aircraft gun version,