Veterans are vulnerable to developing addictive disorders that may become more complicated by problems such as traumatic brain injury and co-occurring psychiatric conditions, including post-traumatic stress disorder and mood disturbances. Alcohol use disorders are frequently observed among veterans and hinder community reintegration after deployment. The U.S. Department of Veterans Affairs (VA) is devoting extraordinary efforts to developing adequate treatment strategies to address this health problem. This study, funded by the Veterans Administration (VA), evaluates treatment outcomes and identifies specific factors that affect veterans' treatment responses. Clients being studied are enrolled in a VA Intensive Outpatient Program that offers rehabilitation treatment to the growing number of veterans with alcohol use disorders in Iowa, Illinois, northern Missouri, and Texas. Cooperation between researchers and clinical staff will allow optimization of treatment strategies that enhance the recovery of veterans with alcohol use disorders. This project is a collaboration of the VA, the University of Iowa, Baylor College of Medicine, and the Iowa Consortium for Substance Abuse Research and Evaluation.