An evaluation of the Air Force Social Actions Seminar Program for educating personnel about drug and alcohol abuse. The authors analyze the objectives, cost, implementation, and effects of the program, and recommend policy changes to improve the effectiveness and efficiency of prevention efforts. Conclusions are that although the seminars have some immediate effects on several attitudinal and informational measures, they are not large and diminish with time. Recommendations are that prevention objectives for the total Air Force population be limited to information transmission and that attempts to change attitudes and behaviors be reserved for special groups, such as at-risk individuals or persons responsible for identifying personnel with alcohol problems. These measures would entail (1) strengthening substance abuse education in Basic Military Training, programs for incoming officers, and base-level orientation programs; (2) increasing the responsibility of supervisors responsible for identifying persons with alcohol problems; and (3) expanding the Alcohol Awareness Seminar for persons with less serious or incipient alcohol problems.