Among the best tanks in terms of both reliability and sheer production capability, M4 Sherman series of tanks became the staple fighting-vehicles of the WWII Allies. The 1st version to be produced, was succeeded by the welded-hull M4, the diesel engine M4A2, and finally the representative tank of the series, the M4A3.
As US bomber operations iniate at airfields all over Southern England from the summer of 1942, the vehicles used in servicing their Liberators and Flying Fortresses were slowly changing from the standard RAF support vehicles, to specialised US Air Force gear.
As the air war over occupied Europe progressively developed, so did the equipment used by the RAF and its Bomber Command. Specialist vehicles were introduced to supply arms and equipment to waiting machines and maintenance tasks were made easier through the introduction of specialised equipment.