Vietnamese victims of the defoliant Agent Orange play at a social sponsorship centre in Vietnam's Danang city June 26, 2009. U.S. warplanes dropped about 18 million gallons of the defoliant on southern Vietnam for most of the 1960s. The defoliant released dioxins that have been blamed for health problems in people exposed. The United States has maintained there is no scientifically proven link between the wartime spraying and the claims of dioxin poisoning by more than 3 million people in Vietnam. Reuters Pictures 5 months ago

Vietnamese victims of the defoliant Agent Orange play at a social sponsorship centre in Vietnam's Danang city June 26, 2009. U.S. warplanes dropped about 18 million gallons of the defoliant on southern Vietnam for most of the 1960s. The defoliant released dioxins that have been blamed for health problems in people exposed. The United States has maintained there is no scientifically proven link between the wartime spraying and the claims of dioxin poisoning by more than 3 million people in Vietnam.