ROBERT C. KOEHLER – Agent Orange, the most powerful of the herbicides used in Vietnam in Operation Ranch Hand, begun on August 10, 1961, contained dioxin, one of the most toxic substances on the planet. We dropped 20 million gallons of this and other herbicides on Vietnam, contaminating 7,000 square miles of its forests. Half a century later, we are fully aware of the consequences of this strategic decision, not just for the Vietnamese, the Laotians, the Cambodians, but also for many American troops.