Operation Ranch Hand was a U.S. military program during the Vietnam War that involved the aerial spraying of herbicides, primarily Agent Orange, to defoliate forests and destroy crops in Vietnam. This operation aimed to deprive the Viet Cong of cover and food sources, thereby impacting their ability to wage guerrilla warfare. The widespread use of these chemicals not only affected the environment but also had long-lasting health effects on both the Vietnamese population and American veterans.