equipped with the Marksman twin gun turret. Chieftain Mineclearer Mine-clearing development. Chieftain Sabre Twin 30 mm AA turret. Chieftain SID Chieftain Signature Integration Demonstrator. Two vehicles modified from Chieftain Mk.12 for TRIGAT trials aimed at reducing battlefield reflectivity and emissions Chieftain Crazy Horse Mobile Range Hard Target. Modified from Chieftain Mk.1 with gun removed and incorporating Skyleader radio control. Remotely controlled range target for use with inert rounds. Used in conjunction with modified Alvis Stormer command vehicle. One built. 1987. Weapon Carriers The Chieftain chassis was adapted to mount air defence weapons ("Marksman" 2 x 35 mm cannon) and a 155 mm howitzer in a number of variants. Operators Current operators : 707 Mk-3P and Mk-5P, 187 FV4030-1, 41 ARV and 14 AVLB obtained before the 1979 revolution. Further planned deliveries of the more capable FV4030-2 (Shir 1) and FV4030-3 (Shir 2) series were cancelled at that point. 100 in service . (100 in 1990, 250 in 1995, 140 in 2000). : 274 Khalid delivered between 1981 and 1985 + 90 MK3/5 (captured Iranian tanks) from Iraq. : 27 delivered 1981–85. Former operators : Used from 1965 to 1995. : 175 in 1976, 143 in 1990, 20 in 1995, 17 in storage in 2000. : 50-75 tanks, captured from Iran, in service with Iraqi Army in 1990. Most upgraded to Khalid-level, with air-conditioning for the crew and reinforced armour and night vision. : 2 delivered for the joint Anglo-Israeli developmental project. In Israeli Armored Corps service for trials 1965–69. : One Chieftain was tested alongside a Leopard between 15 January and 22 March 1968 by the Detachement ter Beproeving van Voertuigen (“Detachment for Testing of Vehicles”) of the Royal Netherlands Army; the tank was allocated British registration number 03 EB 81 and Dutch number KZ-99-65. The Leopard was eventually selected largely because of the Chieftain's poor construction quality, especially the engine, which leaked so much oil that the engine compartment turned black. See also Tanks of comparable role, performance and era Leopard 1 German main battle tank Merkava tank (Early models) Israeli main battle tank M60 tank US main battle tank T-55M T-62 T-72 T-64 : Approximate Soviet equivalent main battle tank Notes References Citations Bibliography External links FAS.org Chieftain Tank Military Factory article Main battle tanks of the United Kingdom Cold War tanks of the United Kingdom Military vehicles introduced in the 1960s Main battle tanks of the Cold