FILE - In this Aug. 9, 2012, file photo, a warning sign stands in a field contaminated with dioxin near Danang airport, during a ceremony marking the start of a project to clean up dioxin left over from the Vietnam War, at a former U.S. military base in Danang, Vietnam. The sign reads; "Dioxin contamination zone - livestock, poultry and fishery operations not permitted." Vietnam and the United States have finished cleaning up dioxin contamination at the airport caused by the transport and storage of the herbicide on and around the area. (AP Photo/Maika Elan, File)
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