In March 1968, Detachment 2 of the 37th Aerospace Rescue and Recovery Squadron at Udorn RTAFB operating HH-3s and HH-53Bs, was transferred to the 40th ARRS.

[2] The 40th moved to Nakhon Phanom Royal Thai Air Force Base on 21 July 1971.

[2]: 127 Following the Paris Peace Accords all remaining US Forces were withdrawn from South Vietnam by 27 March 1973.

[2]: 128 The USAF continued combat operations over Cambodia until 15 August 1973 and the 40th provided CSAR support during this period.

[2]: 136 The 40th moved to Korat Royal Thai Air Force Base on 1 October 1975.