Olga Anderson was trained as a nurse at the Brisbane General Hospital and enlisted in the Australian Army Nursing Service on 1 December 1941.
Olga was attached to the 117th Australian General Hospital (AGH), which set up in Toowooba, Queensland. The 117th AGH requisitioned the Glennie Anglican Girls School and Downlands College to conduct its operation.
Later, Olga served in New Guinea with the 2/8th Australian General Hospital. She was discharged on 7 January 1947 with the rank of lieutenant.