A U.S. Air Force crew member stands by the massive defoliant mixing machine inside one of three C-123 aircraft being used to clear jungle growth in South Vietnam in Aug. 1963. (AP Photo/Horst Faas)
A U.S. Air Force crew member stands by the massive defoliant mixing machine inside one of three C-123 aircraft being used to clear jungle growth in South Vietnam in Aug. 1963. (AP Photo/Horst Faas)