sentences:  The corps' engineers are also responsible for upgrading the tanks in use.The maintenance corps role in improving Jordanian ground units, is to apply enhanced targeting systems on the M60 Patton, the full reconstruction of several other vehicles such as the Centurion tank and to upgrade the 274 Chieftain tank in a redesign called Khalid ibn al-Walid.The Jordanian engineers were able to revolutionise the Challenger 1 turret system with an auto loader and a 120 mm smooth-bore gun.