This book contains papers presented at a conference, which describe studies of a World War II hepatitis epidemic, a genetic analysis of substance use in veteran twins, hemorrhagic fever with renal syndrome, the psychological effects of military captivity, and dioxin in adipose tissue. Other papers discuss radiation risk studies in military populations and resources for epidemiologic research in Vietnam-era veterans. This volume should be of interest to epidemiologists, medical researchers, and others interested in public health.