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23 hours ago · t. e. Agent Orange is a chemical herbicide and defoliant, one of the tactical use Rainbow Herbicides . It was used by the U.S. military as part of its herbicidal warfare program, Operation Ranch Hand, [1] during the Vietnam War from 1961 to 1971. [2] It is a mixture of equal parts of two herbicides, 2,4,5-T and 2,4-D.