Agent Orange Sprayed: Vietnam's Toxic Legacy Begins

American military aircraft sprayed a chemical herbicide over the Vietnamese jungle on August 10, 1961, marking the first use of Agent Orange in the Vietnam War. The operation was part of a defoliation campaign designed to strip the dense tropical canopy that concealed Viet Cong supply lines and staging areas along the Ho Chi Minh Trail. What began as a tactical measure to deny the enemy cover became one of the most devastating environmental and humanitarian disasters of the twentieth century. Agent Orange was a mixture of two herbicides, 2,4-D and 2,4,5-T, manufactured in concentrated form and sprayed from C-123 transport aircraft in Operation Ranch Hand, which adopted the motto "Only We Can Prevent Forests." The chemical's name came from the orange stripe painted on its storage drums. Between 1961 and 1971, approximately 20 million gallons of Agent Orange and other herbicides were sprayed over roughly 4.5 million acres of South Vietnam — an area larger than Connecticut and Rhode Island combined. The manufacturing process produced a toxic contaminant: dioxin (TCDD), one of the most poisonous substances known to science. Military planners either did not know or did not adequately consider the health effects of dioxin exposure. Millions of Vietnamese civilians and hundreds of thousands of American service members were exposed. The consequences emerged over years and decades: elevated rates of cancer, birth defects, neurological disorders, and other chronic illnesses among both Vietnamese populations and American veterans. The U.S. military halted Agent Orange use in 1971 after studies confirmed its toxicity, but the damage was already embedded in Vietnam's soil, water, and food chain. Dioxin persists in the environment for decades. The Vietnamese government estimates that three million of its citizens suffer health effects from herbicide exposure, including second and third-generation birth defects. American veterans fought for decades to obtain disability recognition and healthcare, achieving significant legal victories only in the 1990s and 2000s. A weapon designed to kill trees ended up poisoning generations of people on both sides of the war.