Agent Orange was a toxic chemical used by U.S. troops during the Vietnam War, intended for defoliation and urbanization efforts, resulting in the destruction of millions of acres of land and severe ecological damage. The herbicide contains dioxin, linked to numerous health issues in exposed populations, including Vietnamese civilians and American veterans, with over 3 million Vietnamese affected and 150,000 children born with birth defects. Legal actions against the producers and various support efforts have followed, but restoration of the affected environment may take over a century.