A4-140 has been gifted to the Australian War Memorial in Canberra, while A4-152 goes to the RAAF Museum at Point Cook.
A4-140 is the Air Force's oldest remaining Caribou, and is the oldest aircraft in the ADF fleet.
It was among the initial three DHC-4 aircraft delivered to Australia in April 1964.
In its 45-year career, A4-140 flew in Vietnam from 1968 to 1971.
In 1975, it was involved in evacuation missions between East Timor and Darwin.
The aircraft supported further flood relief in Australia in 1983 and 1988, and supported the Search and Rescue detachment at RAAF Base Pearce in the 1980s.
A4-140 has continued active service with 38 Squadron.
A4-152 has accumulated 20,360 flying hours, and was delivered to RAAF Richmond on 13 June, 1964 with two others.
The Caribous were the first RAAF aircraft deployed to Vietnam and the last to withdraw.
A4-152 served in Vietnam from October 1967 to September 1968.
It was severely damaged in an accident in Vietnam and was shipped home for repairs to Bankstown.
Its operations after repair included Sumatra in 1971, with the UN in 1975, 1976, 1977 and 1978 and survey flights in West Irian in 1976.
The aircraft served on humanitarian support missions in the Solomons in 1980 and 2003 and on peacekeeping missions in East Timor in 1999.