FILE- Attendants sit next to a field contaminated with dioxin before 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, Aug. 9, 2012. (AP Photo/Maika Elan, File)FILE- A Vietnamese soldier stands guard in front of military aircraft near a dioxin contaminated area while U.S. Defense Secretary Jim Mattis visits Bien Hoa air base in Bien Hoa, outside Ho Chi Minh City, Vietnam, Oct. 17, 2018. (Kham/Pool Photo via AP, File)FILE- A detail of South Vietnamese Air Force men load up a tractor-train of 500-pound bombs from the Bien Hoa Air Base ammunition depot, Dec. 29, 1964. (AP Photo/Horst Faas, File)FILE- A Vietnamese worker sprays water over stones to be used in the construction of a silo for storing soil contaminated with Agent Orange dioxide at the site of a former American airbase in Danang, Vietnam on April 24, 2013. (AP Photo/Hau Dinh)FILE- 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, Aug. 9, 2012. The sign reads; "Dioxin contamination zone - livestock, poultry and fishery operations not permitted." (AP Photo/Maika Elan, File)FILE -A woman walks next to a highly contaminated pond around the grounds of the Danang airbase in Danang, Vietnam, May 21, 2007. (AP Photo/David Guttenfelder, File)
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FILE- Attendants sit next to a field contaminated with dioxin before 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, Aug. 9, 2012. (AP Photo/Maika Elan, File)
