Updated evaluations were conducted every two years to review newly available literature and draw conclusions from the overall evidence veterans and agent orange update 2014 is a cumulative report of the series thus far. Veterans and agent orange update 2014 from 1962 to 1971 the us military sprayed herbicides over vietnam to strip the thick jungle canopy that could conceal opposition forces to destroy crops that those forces might depend on and to clear tall grasses and bushes from the perimeters of us base camps and outlying fire support bases mix . 1 mil med 2017 jul18271619 1620 doi 107205 milmed d 17 00130 veterans and agent orange update 2014 no authors listed pmid 28810951. Veterans and agent orange update 2014 is the tenth congressionally mandated biennial update by the national academies and presents the consensus committees findings these are based on reviews of epidemiologic studies of veterans where available and of other populations who were exposed to the herbicides via their occupation environmental contamination or poisoning