In January 1995 the Institute of Medicine released a preliminary report containing initial findings and recommendations on the federal government's response to reports by some veterans and their families that they were suffering from illnesses related to military service in the Persian Gulf War. The committee was asked to review the government's means of collecting and maintaining information for assessing the health consequences of military service and to recommend improvements and epidemiological studies if warranted. This new volume reflects an additional year of study by the committee and the full results of its three-year effort.