Equal parts of 2-4-D mixed with 2-4-5-T. It was sprayed from aircraft along the Ho Chi Mein Trail, and other places in Vietnam to kill off the trees and underbrush. The 2,4,D kills broad leafed plants that do not have woody stems. 2,4,5,T kills woody stemmed plants. They were mixed with different kinds of oils like kerosene to make them stick to the plant and work better. http://www.vvvc.org/agntor.htm Agent Orange is an herbicidal defoliant used by the United States during the Vietnam to deprive Viet Cong and North Vietnamese soldiers of forest cover and food crops.