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The Chieftain Mk 2 was the main battle tank of the British army between the 1960's and 1980's and is still in service today with Iran. Due to its powerful armament and effective armor the tank quickly became known as one of the most formidable tanks in the world (Source: Janes Defense). Based on the Centurion, the Chieftain design was remarkable for the supine (upward facing) driver position which allowed for a heavy slope of the hull resulting in a reduced height of the vehicle. The tank road speed was 48 km/h which was higher than the speed of its predecessor.