One of the manning issues involves the various directorates in this case Armour and Engineers, some of which continue till this day. In the British system Armour has precedence over Engineers. The argument goes "It is a tank - regardless of its fittings or use therefore it is manned by the Armoured Corps". The countervailing argument is "Regardless of its origins it is an engineering vehicle it is employed using the principles of employing engineers in battle therefore it is to be manned and operated by Engineers". It was hard enough getting Armoured Corps to agree to sappers manning the Petard equipped Churchills let alone additional vehicles such as Crocodiles or allowing infantry men to crew the Kangaroo APCs.