On 1 June 1966, the RAAF Transport Flight Vietnam (RTFV), which had been formed for operations in Vietnam in July 1964, was redesignated No. 35 Squadron at Vung Tau in South Vietnam. Assigned to the 834th Air Division, Seventh Air Force, and operating DHC-4 Caribous, the re-formed squadron flew cargo, passenger and medevac flights throughout South Vietnam in support of Australian, South Vietnamese and United States forces. During its time in Vietnam the squadron was nicknamed "Wallaby Airlines", in reference to its callsign "Wallaby". Despite not being employed in an offensive role, the squadron's aircraft were regularly called upon to fly into dangerous areas of the conflict zone, often at low level, and on several occasions the Caribous were fired upon and aircrew wounded.