MU Art Model - Cheifitan Main Battle Tank - Medium LevelChieftain Main Battle Tank The FV4201 Chieftain was the main battle tank of the United Kingdom during the 1960s, 1970s and 1980s. A development of the Centurion, the Chieftain introduced the supine (reclining) driver position to British design allowing a heavily sloped hull with reduced height. A new powerpack and improved transmission gave it higher speed than the Centurion despite being heavier due to major upgrades to armour protection and the