A study used an existing data set to assess the predictive validity of the Armed Services Vocational Aptitude Battery (ASVAB) for civilian occupations. (The ASVAB is a multiple-aptitude test battery used by all military services to determine the qualifications of candidates for enlistment and assign enlistees to military occupations.) The relationships between ASVAB scores and actual career choices were examined for the same nationally representative sample of youth and young adults (n=12,686) as those participating in the ongoing National Longitudinal Survey of Youth. Discriminant analyses were performed to assess the extent to which ASVAB scores could be used to differentiate individuals in different occupations or occupational groups. The ASVAB-based discriminant functions resulted in a significantly greater number of individuals being correctly classified than would be expected by chance. In particular, ASVAB scores were most effective in predicting occupational membership for jobs that involved higher, or lower, degrees of complexity of work with data. Additional analyses were performed to assess the extent to which ASVAB scores could differentiate individuals who were satisfied with their occupational choices. Results showed no pattern of significant relationships between ASVAB scores and job satisfaction but supported the validity of the ASVAB for predicting membership in civilian occupations. (Appendixes include a list of 21 references and some data set items used in the validation analyses.) (Author/YLB)