The Centurion was the primary British Main Battle Tank of the immediate post-war era, and considered by many to be one of the best British tank designs of all time. Designed during the Second World War it served in Europe, but arrived just too late for combat. It went on to provide excellent service during the Korean War where it outperformed both US and Soviet designs by a wide margin. It would go on to be one of the most widely used tank designs, equipping armies around the world, with small numbers still in service until the 1990s.In July 1944 the ARK was improved. The ramps were made longer and the left hand trackway was widened from 65 cm to 1.30 meter, so vehicles with a narrow wheel track could also use it. The ramps were held in upright position by kingposts when driven. A quick release mechanism dropped the ramps in place. There was no mechanism to bring them back up (this could be done with a recovery tank), because these ARK's were considered expendable.