This paper presents the results of some observations on the selection and performance of junior officers in the Marine Corps. Major results are based on 100 cases. Sociometric group opinion was a more valid predictor both of success in Officer Candidate School and of combat performance than several objectivet ests (intelligence, two personal inventories, and Army Mechanical Aptitude Test). Reasons for the relative superiority of group opinion are discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)