RANCH HAND

Opening

From 1962 to 1971, United States Air Force C-123 transport planes sprayed herbicides over South Vietnam, and to a lesser degree Laos and Cambodia, under Operation Ranch Hand. The aim was to strip the jungle that hid enemy troops and to destroy the crops that fed them. About 19 million gallons were sprayed, and roughly a fifth of South Vietnam's forests were hit at least once.

The most used mixture was Agent Orange. Much of the herbicide carried a contaminant, the dioxin TCDD, now classed as a known human carcinogen. The spraying ended in 1971. The arguments over what it did to American veterans and Vietnamese civilians have gone on ever since.

Timeline

10 August 1961The first test spray is flown in South Vietnam.

1962Operational spraying begins under the name Operation Hades, later renamed Ranch Hand. President Kennedy approves individual spray missions himself until November 1962, when most approval passes to the US command in Vietnam and the ambassador.

Mid-1960sSpraying expands sharply, including against food crops.

1970Use of Agent Orange is halted amid concern over the health effects of its 2,4,5-T component.

7 January 1971The last Ranch Hand spray run is flown. Remaining Agent Orange stocks are gathered at Da Nang, Bien Hoa and Tuy Hoa air bases and later shipped to the South Pacific to be burned at sea.

1984A class action by American veterans against the herbicide manufacturers is settled out of court for $180 million.

1991Congress passes the Agent Orange Act, creating a list of presumed illnesses that qualify veterans for compensation and care.

2004 to 2005A lawsuit filed by Vietnamese victims is dismissed by United States courts. The Supreme Court later declines to hear it.

2010The State Department announces a $34 million programme to clean dioxin from the soil at Da Nang airport.

Key figures

The Ranch Hand crews flew low and slow over hostile territory. Their call sign was Hades.

President Kennedy authorised the programme and, for most of 1962, approved missions personally.

The chemical companies that made the herbicides became the defendants in the veterans' lawsuit and settled without admitting liability.

The Vietnamese government says about 4.8 million people were exposed and 400,000 killed or maimed, with 150,000 children born with serious birth defects. The United States government has called these figures unreliable.

Physical and documentary trail

The trail: Air Force mission records and gallon counts, the Kennedy-era authorisations, the 1984 settlement, the 1991 Act and the medical reviews behind it, and decades of Vietnamese and international studies. The dioxin is also physical evidence: Bien Hoa, Da Nang and Phu Cat remain heavily contaminated and are on Vietnam's priority cleanup list. What is missing is an agreed count of the people harmed.

Things you might not know

• The motto was a joke. Ranch Hand crews parodied Smokey Bear with "Only you can prevent a forest."
• Orange was one colour of many. The "Rainbow Herbicides" included Agents Blue, White, Green, Pink and Purple, named after the stripes on their drums.
• Agent Blue was for rice. The arsenic-based mixture was used mainly to destroy food crops.
• Each plane carried 1,000 gallons. That was the size of the tank fitted to each C-123.
• Orange was half and half. Agent Orange was a 50/50 mix of two herbicides, 2,4-D and 2,4,5-T. The dioxin came with the 2,4,5-T.
• The leftovers were burned at sea. After 1971 the surplus stocks were shipped to the South Pacific for incineration.

Competing explanations

A chemical war on a landscape and a people. This reading points to the scale of the spraying, the deliberate destruction of crops, the dioxin hotspots that remain, and the Vietnamese health figures.

A military tool whose harm was not understood at the time. The defoliation had a real tactical purpose, the dioxin was a manufacturing contaminant rather than the intended agent, and the use of Agent Orange was halted once health concerns became serious.

Overstated health claims. Some officials and researchers have argued that specific illness counts, particularly the Vietnamese figures, cannot be separated from other causes. That debate is about numbers, not about whether the spraying happened.

Later life of the case

Agent Orange became one of the defining legacies of the Vietnam War, in veterans' politics in the United States and in public health in Vietnam. Cleanup of the dioxin hotspots, with American funding, has become part of the diplomatic relationship between the two countries.

Finding

Ranch Hand sprayed about 19 million gallons of herbicide over Southeast Asia, much of it contaminated with dioxin, and the hotspots are still being cleaned. That is documented. The open question is the human toll: the United States compensates veterans for a list of presumed illnesses but disputes Vietnam's figures for its own people.

What still will not resolve: an agreed, independently checked count of Vietnamese civilians harmed by the spraying.