In early 1966, the military services were directed to explore the feasibility of creating an aptitude test battery which would stimulate interest in military service, provide counselor and student information on vocational aptitudes, provide the services with information on enlistment prospects, establish mental qualifications for enlistment and induction, identify enlistment applicants for particular occupational or training systems, and classify and assign personnel. A working group consisting of personnel test experts from all of the military services was set up to study the feasibility of such a test battery, and to develop a prototype. The Armed Services Vocational Aptitude Battery (ASVAB) was developed from this effort. The essential purpose of the present study was to develop information on the relationship between performance of high school students on the subtests and composites of the ASVAB, and their subsequent performance in civilian vocational curricula. Approximately 4300 high school students took the ASVAB in 1973-74, and the validity of each subtest was established through multiple regression analysis of the test scores and the corresponding students' grades. (BW)