Operation Ranch Hand

Operation Ranch Hand was a U.S. military operation during the Vietnam War. It lasted from 1962 until 1971 and was part of a bigger effort called "Operation Trail Dust" to use special chemicals to clear forests and crops. The goal was to stop enemy forces by removing the food and hiding places they used.

The operation sprayed a huge amount of chemicals—about 19 million U.S. gallons—over areas in South Vietnam, and some parts of Laos and Cambodia. These chemicals damaged forests and crops over many years. Nearly 20,000 flights were made to spray these chemicals, covering a large part of the land.

The U.S. Air Force used special planes called C-123s for the spraying. These planes could cover a wide path of land very quickly. Most of the chemicals used in the war were sprayed as part of Operation Ranch Hand, with a small amount sprayed by other groups using different methods.

Defoliants

During the Vietnam War, the U.S. military sprayed special plant-killing chemicals over parts of South Vietnam. These chemicals were used to remove plants and trees that might hide enemy forces. The most common of these was called Herbicide Orange, or Agent Orange, which was a mix of two different plant-killing chemicals made by companies like Monsanto and Dow Chemical. Other chemicals used included Agent Blue, mainly against crops, and Agent White, used when Agent Orange wasn’t available.

These chemicals are part of a group called the Rainbow Herbicides. They were sprayed in very high amounts—up to 50 times more than what farmers normally use. Some of these chemicals contained a harmful impurity that could cause health problems. Large amounts were sprayed over parts of Vietnam, Cambodia, and Laos during the war.

Operations

Operation Ranch Hand was a part of the Vietnam War and was based at several air bases, such as Bien Hoa Air Base and Da Nang Air Base. Its main goal was to spray special liquids over forests and farms to remove plants that might help enemy forces hide. These operations took place mainly in areas like the Mekong Delta and along the Ho Chi Minh trail.

The first test spraying happened in 1961, and the full operation began in 1962. The sprays were planned carefully to hit specific areas, and planes flew low to spray them. The weather and type of plants affected how well the spraying worked. Some plants needed to be sprayed more than once to be removed completely.

Scientific community reaction

Many scientists were concerned about the use of plant-killing chemicals during the Vietnam War. As early as 1964, a group of scientists called the Federation of American Scientists spoke out against these chemicals. In 1966, a big science group, the American Association for the Advancement of Science, asked for a careful check of the effects of these chemicals in Vietnam. By 1967, seventeen winners of the Nobel Prize and thousands of other scientists signed a request to stop using these chemicals right away.

In 1970, scientists visited Vietnam to study how these chemicals were affecting nature and plants. Earlier studies had shown that one of the chemicals could cause health problems in animals, which led the U.S. government to stop using it in the United States that same year. Some chemical spraying continued until the last flight on January 7, 1971.

Human impact

The use of special plant-cutting sprays during a war caused lasting damage to the people of Vietnam and their land. Many Vietnamese people were exposed to these sprays, which led to serious health issues and birth problems for many children. The Red Cross of Vietnam says that up to one million people have health problems because of this exposure. The United States government has different views on these numbers. Many American service members were also exposed and some have health problems connected to these sprays.