During the Vietnam War from 1962 to 1971, the United States sprayed defoliants like Agent Orange to remove trees and vegetation that provided cover for enemy forces. These chemical weapons are estimated to have maimed or killed between 400,000 to 500,000 people, including many civilians. While the U.S. has renounced chemical weapons, questions remain about whether the U.S. continues chemical weapons research and what policy it will take regarding allegations of current uses by Syria and other nations.

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