Fifteen different herbicides were shipped to and used in Vietnam between January 1961 and 1971. Agent Orange accounted for over most of the herbicides sprayed in Vietnam. Agent Orange was used between January 1965 and April 1970. Herbicides other than Agent Orange were used in Vietnam prior to 1965, but to a very limited extent. However, a recent study released in April 2003 found that while relatively small amounts of highly dioxin-contaminated Agents Purple and Pink were sprayed in the early 1960s, these agents might have deposited a relatively large percentage of the total dioxin. The total area sprayed with herbicides between 1962 and 1965 was small, less than 7 percent of the total acreage sprayed during the Vietnam conflict. Rapid increases in the annual number of acres sprayed occurred from 1962 to 1967. The number of acres sprayed reached a maximum in 1967, leveled off slightly in 1968 and 1969, and declined rapidly in 1970 prior to the termination of spraying in 1971. During this time more than 19 million gallons of herbicides were sprayed over 6 million acres, some of which were sprayed more than once. More than 3.5 million acres of South Vietnam approximately 8.5 percent of the country were sprayed one or more time. Spraying occurred in all 4 military zones of Vietnam.
In Korea, Agent Orange was used by the Republic of Korea Forces in 1968-69. Use was restricted to a strip of land just south of the demilitarized zone and North of the civilian control line. The strip extended along the line for many kilometers. Department of Defense officials have advised us that US troops did not do the spraying. Heavily sprayed areas included inland forests near the demarcation zone; inland forests at the junction of the borders of Cambodia, Laos, and South Vietnam; inland forests north and northwest of Saigon; mangrove forests on the southernmost peninsula of Vietnam; and mangrove forests along major shipping channels southeast of Saigon. Crop destruction missions were concentrated in northern and eastern central areas of South Vietnam.