A study investigated the alternate forms reliability of the Armed Services Vocational Aptitude Battery (ASVAB) Forms 8, 9, 10, and 11. Usable data were obtained from 62,938 armed services applicants who took the ASVAB in January and February 1983. Results showed that the parallel forms reliability coefficients between ASVAB Form 8a and the production tests (Forms 9a through 10b) on the subtests and composites ranged from .67 to .93. The subtest and composite reliability coefficients between Form 11a and the production tests ranged from .68 through .94. The subtest and composite reliability coefficients were quite consistent across test forms. Subgroup analyses indicated that reliability coefficients for subtests and composites were slightly higher for males than females and slightly higher for Whites than for Hispanics and Blacks. However, the subgroup reliability coefficients were still acceptably high. Subtest scores were never used alone, with only composites scores used for selection and classification decisions. (CML)