 Complete the following phrase:  The Chieftain tank based Willich Chieftain AVRE entered service in 1987. This vehicle was designed by Capt D Clegg MBE RE. Twelve vehicles were built by 32 Armoured Engineer Regiment and 21 Engineer Base Workshop of the Royal Engineers under the direction of Lt Col JF Johnson RE based in the German town of Willich, hence its name. Some of these vehicles saw use in the 