The U.S. Navy provides treatment for alcoholism in three types of facilities. Alcohol Rehabilitation Centers ARC and Alcohol Rehabilitation Services ARS provide approximately 6 weeks of residential treatment. Services, formerly called Units, are located in medical facilities. Alcohol Rehabilitation Drydocks ARD provide outpatient counseling services and, in some instances, short-term residential treatment. Upon completion of rehabilitation most participants return to normal duty assignments and complete their obligated tours of Navy service successfully. Failure to control alcohol abuse problems is costly to the individual and to the Navy because of the absenteeism, morbidity, reduced proficiency, and premature attrition that results. A major purpose of this study is to compare characteristics of the populations treated at the three types of rehabilitation facilities, determine differences in post-treatment outcome, and relate population differences in post-treatment outcome. A second objective was to examine the consistency of predictors of post-treatment outcome among types of facilities and among individual facilities. Consistency in predictive validities would tend to support the proposition that population characteristics generally are important in determining program effectiveness success or failure rates and that program differences are of less importance in determining rehabilitation results.