Selection and classification testing throughout the nation has been subject to widespread criticism and legal attack. Tests used by the military service, however, have been largely immune from the criticism. A major reason is that from their inception, military tests have been carefully validated as predictors of successful performance. The traditional criterion measure in the military has been success in skill training courses. In this report a significant new measure of successful performance has been used as the criterion measure. The Skill Qualification Test (SQT), developed by the Army to assess performance on critical job tasks and identify training deficiencies, was used as the criterion for evaluating the effectiveness of the Armed Services Vocational Aptitude Battery (ASVAB) and for developing new aptitude composites. The aptitude composites had high validity in the range .52 to .75 for predicting job proficiency. Criticisms of the usefulness of SQTs as measures of job proficiency are addressed. (Author/GK)