Ranch Hand : 'Ranch hand' refers to the US military servicemen who served as Air Force Operation Ranch Hand or Army Chemical Corps members in Vietnam, and were directly involved in the application of Agent Orange (and other herbicides)
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}