The service, or combat support, corps enable the arms corps to operate effectively in the field.
Transport, supply and maintenance
Originally the Australian Army had two main service corps: the Ordnance Corps and the Service Corps. Ordnance was generally responsible for machinery and ammunition. It organised the supply and storage of ammunition and the repair and maintenance of machinery, vehicles and weapons. The Army Service Corps was responsible for the transport and provision of supplies and rations other than machinery or ammunition; this included the delivery of mail to the troops. This corps also provided additional transport resources for moving troops.
In the latter years of the Second World War and in the years after, these two large corps were split into several smaller corps with the following responsibilities:
The provision of all supplies to Army units and the management of personnel;
The transport of supplies, mail and personnel by land, and sea and air;
Electrical and Mechanical Engineers
The maintenance, recovery and repair of machinery, vehicles, electronic equipment and weapons; and
The provision of meals and the management of mess facilities.
In more recent times, the trend in the Army has been to call the foregoing "logistics" units and to integrate them into support groups, a concept in many ways similar to the original Service Corps.