新山一空軍基地 越南共和國（南越）空軍使用情形
Flying specially-equipped C-123 Providers, members of the squadron flew low and slow to reduce the risks to our soldiers on the ground and to expose the enemy.  Ranch Hand never had more than five C-123Bs. Sometimes these aircraft had their spray equipment removed to conduct regular airlift flights, and it appeared that the defoliation mission might be eliminated altogether. With the increased U.S. commitment in South Vietnam in 1964 and 1965, however, requests for defoliation soared.
Ranch Hand grew into an essential part of the war effort, with over six million acres sprayed in South Vietnam between 1965 and 1969. Beginning in 1965 with only four aircraft, by the middle of 1969 Ranch Hand had about 25 UC-123 aircraft available for missions.  On 15 October 1966, Ranch Hand became the mission of the 12th Air Commando Squadron.
In 1965 Ranch Hand began using a very effective defoliant called Agent Orange, and the range of targets grew considerably.  The Agent Orange controversy later became both a political and veterans' issue. Operation Sherwood Forest sprayed the key Viet Cong-controlled Boi Loi Woods northwest of Saigon, and Operation Swamp Fox targeted the mangrove forests used by the communist for shelter in the Mekong Delta. Late in the year, operations extended into the Ho Chi Minh Trail in Laos. A flood of defoliation requests came in, and the small number of crews flew constantly.
The defoliation of vital enemy strongholds, transportation routes, and crops forced the communists to vigorously defend against the spraying. Ranch Hand aircraft regularly received damage on missions—considering their low altitude, low speed and large size, they were easy to hit. Ranch Hand maintainers worked constantly to repair the damage and get their UC-123s ready for the next mission. In addition to engines and flight controls shot out, and several crewmen wounded and killed, Ranch Hand lost five UC-123s in combat between 1966 and 1968.
In February 1967, Ranch Hand was ordered for the first time to fly missions over the De-Militarized Zone (DMZ) separating North and South Vietnam. These missions helped uncover infiltration routes from the north and expose stockpiles of supplies hidden in the DMZ. By June, 1967, the number of UC-123s had increased to 20.
During the Tet Offensive in early 1968, spraying operations were temporarily halted in favor of airlift missions. Between Feb. 5 and March 20, Ranch Hand UC-123s flew 2,866 airlift sorties.
The 315th ACW was transferred to Phan Rang Air Base on 14 June 1967.  With the Vietnamization drawdown in 1969, Ranch Hand was reduced from 25 to 13 aircraft. In 1970 Agent Orange was discontinued, and the existing stocks of Agent White ran out in May 1970. After the last anti-crop mission in January 1971, anti-mosquito spraying continued for a short time after, and then Ranch Hand ended.
Late in 1966 the division was reassigned without personnel or equipment, to Tan Son Nhut Air Base, South Vietnam, to join Pacific Air Forces Seventh Air Force, providing an intermediate command and control organization and also act as host unit for the USAF forces at Tan Son Nhut Air Base..
The 834th AD was formed from the 315th Troop Carrier Group (Combat Cargo) and 8th Aerial Port Squadron of the former C-123 Provider "Mule Train" units, and the "Dirty Thirty" provisional transport units.  Initially the 834th AD had a strength of twenty-seven officers and twenty-one airmen, all of whom were on permanent assignment to Tan Son Nhut.
The Air Division served as a single manager for all tactical airlift operations in South Vietnam, using air transport to haul cargo and troops, which were air-landed or air-dropped, as combat needs dictated through December 1971.   The 834th Air Division became the largest tactical airlift force in the world.  It  was capable of performing a variety of missions. In addition to
airlift of cargo and personnel and VNAF training. its missions and activities included "Ranch Hand" defoliation and insecticide spraying, psychological leaflet distribution, helicopter landing zone preparation, airfield survey and the operation of aerial ports.
Units it directly controlled were:
Located at: Tan Son Nhut AB; later Phan Rang AB (15 June 1967-1 December 1971) UC-123 Provider.  Composed of four C-123 squadrons with augmentation by C-130 Hercules transports from the 315th Air Division, Tachikawa AB, Japan.
2 C-123 Squadrons (32 a/c) at Tan Son Nhut AB; one (16 a/c) at Nha Trang AB; one (16 a/c) at Da Nang AB.
C-130 aircraft assignments were 20 aircraft at Tan Son Nhut; 8 at Nha Trang; 1 at Da Nang, along with 10 at Cam Ranh AB; 4 at Don Muang RTAFB and 5 at Ubon RTAFB, Thailand
Located at: Cam Ranh AB 5 C-7A Caribou squadrons (Taken over from US Army), C-130B Hercules (Det 2, 834th AD)
2 C-7A Caribou squadrons at Phu Cat AB.
8th Aerial Port Squadron, Tan Son Nhut (16 detachments)
14th Aerial Port Squadron, Cam Ranh AB (13 detachments)
15th Aerial Port Squadron, Da Nang AB (14 detachments)
Detachments were located at various points where airlift activity warranted continuous but less extensive aerial port services. Aerial port personnel loaded, unloaded, and stored cargo and processed passengers at each location.
The 834th AD also directed its crews to fly aeromedical evacuations missions within South Vietnam in support of the 903d Aeromedical Evacuation Squadron at Phu Cat AB, using C-7 Caribous and C-118 Liftmasters operating from mobile casualty staging facilities at medical field stations having operating airfields.
In addition, the 834th supervised transport operations (primarily C-47's) of the South Vietnamese Air Force and six A-4 Wallaby transports operated by the Royal Australian Air Force 35 Squadron at Vũng Tàu Army Airfield. The 834th's flying components also performed defoliation missions, propaganda leaflet drops, and other special missions.
C-123s from the Divisions's  311th Special Operations Squadron, (315th TAW) flew supplies into the surrounded Khe Sanh Combat Base, Vietnam in 1968 in relief of Marines and Army units there.  C-130s and C-7s also flew highly hazardous missions, dropping cargo on the dirt airstrip at the outpost.  The 834th received the Presidential Unit Citation recognizing their effort.
The Cambodian campaign was an incursion into Cambodia by United States and South Vietnamese armed forces in May and June 1970. The objective was to destroy faci1ities and supplies stored by the North Vietnamese within Cambodia. which the US had previously regarded as a sanctuary. The operation was supported heavily by tactical air strike and airlift forces. All three types of airlift aircraft (C-123, C-130, C-7) were employed by the 834th AD operating into 24 jungle airfields along the South Vietnam-Cambodian border, and airlifting more than 52.000 tons of supplies and equipment and 98,000 troops and passengers.
C-l30s airdropped ammunition and supplies to fire base personnel and Cambodian troops, and during the last week of June, C-7s and C-123s evacuated more than 3,000 Cambodian refugees from the
Cambodian airstrips of Bung Lung and Ba Kev
During its last few months, the 834th worked toward passing combat airlift control to Seventh Air Force.  On 1 December 1971 the 834th AD was inactivated as part of the USAF withdrawal of forces from Vietnam.
The 377th Air Base Wing was responsible for the day-to-day operations and maintenance of the USAF portion of the facility from April 1966 until the last USAF personnel withdrew from South Vietnam in March 1973. In addition, the 377th ABW was responsible for housing numerous tenant organizations including Seventh Air Force, base defense, and liaison with South Vietnamese Air Force.
Units assigned to the 377 ABW were:
In 1972 deactivating USAF units throughout South Vietnam began to administratively assign units w/o equipment or personnel to the 377th ABW:
From Phan Rang Air Base:
From Cam Ranh Air Base:
From Phan Rang Air Base
All of these units were administratively inactivated in place at Tan Son Nhut.
An operating location of the wing headquarters was established at Bien Hoa Air Base on 14 April 1972 to provide turnaround service for F-4 Phantom IIs of other organizations, mostly based in Thailand. It was replaced on 20 June 1972 by Detachment l of the 377th Wing headquarters, which continued the F-4 turnaround service and added A-7 Corsair IIs for the deployed 354th Tactical Fighter Wing aircraft based at Korat RTAFB, Thailand on 30 October 1972. The detachment continued operations through 11 February 1973.
The 377th ABW phased down for inactivation during February and March 1973, transferring many assets to the South Vietnamese Air Force. 
When deactivated on 28 March 1973, the 377th Air Base Wing was the last USAF unit in South Vietnam.