WASHINGTON — A Pentagon study has found high rates of cancer among military pilots and for the first time has shown that ground crews who fuel, maintain and launch those aircraft are also getting sick. > dfpAd('article');>Isolating potential causes is difficult, and the Pentagon was careful to note that this study "does not imply that military service in air crew or ground crew occupations causes cancer, because there are multiple potential confounding factors that could not be controlled for in this analysis," such as family histories, smoking or alcohol use. After her husband got sick, Betty Seaman asked him if he would have chosen differently, knowing his service might be linked to his cancer