assigned they were dependent on support from US Army advisers in each of South Vietnam's four military corps areas to use US Army and Marine Corps helicopters. In April 1962 the unit was designated Detachment 3, Pacific Air Rescue Center. On 1 July 1965 Detachment 3 was redesignated the 38th Air Rescue Squadron and activated with its headquarters at the base and organized to control search and rescue detachments operating from bases in South Vietnam and Thailand. Detachment 14, an operational base rescue element, was later established at the base. On 8 January 1966 the 3d Aerospace Recovery Group was established at the base to control search and rescue operations throughout the theater. On 1 July 1971 the entire 38th ARRS was inactivated. Local base rescue helicopters and their crews then became detachments of the parent unit, the 3d Aerospace Rescue and Recovery Group. In February 1973 the 3d Aerospace Rescue and Recovery Group left Tan Son Nhut AB and moved to Nakhon Phanom Royal Thai Navy Base. Miscellaneous units From December 1961, the 8th and 57th Transportation Companies (Light Helicopter) arrived with Piasecki CH-21C Shawnee's. From 1962 the Utility Tactical Transport Helicopter Company (UTTHCO) was based here initially with Bell HU-1A Huey's then UH-1B's. The 1964th Communications Squadron was designated and organized at Tan Son Nhut on 1 May 1962, in accordance with AFCS G-23 instructions of 29 March 1962. It was assigned to the Southeast Asia Communications Region (itself part of the Pacific Communications Area), Air Force Communications Service. It was upgraded to become the 1964th Communications Group on 1 October 1962 and appears to have directed about 10 squadrons in the Republic of Vietnam. It provided communications and navaids for Air Force fixed bases in the country. One of its squadrons was the 1876th Communications Squadron, designated and organized at Tan Son Nhut on 1 November 1965. The 1876th Communications Squadron was reassigned on 1 April 1972, and moved to the United States Air Force Academy in Colorado. The 57th Medical Detachment (Helicopter Ambulance) with UH-1B Hueys from January 1963. During December 1964 the 145th Aviation Battalion were deployed here. In April 1964 5 EC-121D airborne early warning aircraft began staging from the base. In June 1964 Detachment 2, 421st Air Refueling Squadron equipped with KB-50 aerial refueling aircraft deployed to the base to support Yankee Team operations over Laos. In April 1965 a detachment of the