This is the third report on the use of a technical classification assessment center (TCAC) for evaluating general detail (GENDET) personnel in the Navy. The first two reports described the development of the TCAC and the validation of the TCAC against supervisors' ratings of job performance for a small exploratory sample. This report presents the further development and modification of the tests and the validation of their usefulness for assigning GENDETS as seamen, firemen, and airmen. A ten-exercise miniature training and evaluation battery (MTEB) was administered to 1,034 Navy recruits who were ineligible for assignment to Navy schools. Followup data were collected after 9 and 18 months. The MTEB exercises were judged to be at an appropriate difficulty level, to possess acceptable discriminating power, and to be adequately unidimensional. The predictive validity of the exercises was found to be moderate. An increase in predictive power was evidenced if the MTEB exercises were employed in conjunction with the Armed Services Vocational Aptitude Battery. The results are interpreted to support the value of the MTEB exercises developed for this study and the MTE concept itself. The appendices include a technical performance criterion form for seamen and a form for collecting criterion data about recruit adjustment. (Author/PN)