Initially, the Australian Survey Corps continued its mapping for the defence of Australia, proceeded with basic survey triangulation and provided training cadre for new field and training units. In January 1940, Field Survey Units RAE (Militia) were established in 1st Military District – Queensland, 2nd Military District – New South Wales and 3rd Military District – Victoria to accelerate the mapping effort. Deputy Assistant Directors – Survey were appointed to Military District Headquarters to advise on survey needs and to liaise with State agencies. In April 1940 the 2/1 Corps Field Survey Company RAE was raised as part of the 2nd Australian Imperial Force for service overseas and a Survey staff was appointed to the formation (Corps) headquarters.