Project CHECO Southeast Asia Study : 9781780398150 : 17 May 2012 : High quality reprint of this recently declassified 1971 study.The primary mission of Ranch Hand was defoliation and crop destruction. Defoliation was directed against enemy strongholds, roadsides, power lines, railroads, and other lines of communication. The objectives were to increase visibility for Forward Air Controller (FAC) and tactical aircraft and to make it more difficult for the enemy to ambush ground forces. Two herbicides were used for. defoliation: Orange, a mixture of 2,4-D and 2,4,5-T chlorophenoxy acids; and White, a mixture of 2,4-D and picloram. Crop destruction was directed at food plots of enemy troops, the objective being to increase their logistics problem. The herbicide used for crop denial missions was Agent Blue, a sodium salt of cacodylic acid. Proposed targets were carefully screened at all echelons. Requests for defoliation and crop destruction were originated by army commanders at or below th