Released in September 2006, this volume from the National Academy of Sciences summarizes "the current status of health effects in veterans deployed to the Persian Gulf irrespective of exposure information." In layman's terms, the volume is primarily concerned with reviewing, evaluating, and summarizing the scientific and medical literature which addresses the current health status of Gulf War veterans. In its findings, the report notes that studies have not found a cluster of symptoms that constitutes a syndrome unique to Gulf War veterans, but those who served in the 1990-1991 conflict are at increased risk for developing anxiety disorders, depression, and substance-abuse problems. The report does note that there is evidence to suggest that there may be an elevated rate of amyotrophic lateral sclerosis (ALS) among these veterans.