Chieftain
Chieftain Mk 3/2 - Improved electrical equipment and air cleaners. Chieftain Mk 3/3 - Mk 3 with ER RMG, laser rangefinder, 720bhp engine & modified NBC pack. Chieftain Mk 3S - Production model of Mk 3/G with turret air-breathing and commander's firing switch. Chieftain Mk 4 - Only two built; greater fuel capacity and minor modifications.