The purpose of this study was to evaluate the influence that certain background and training factors may have upon the relationships between test scores and criterion measures. Enlisted personnel who enter Navy training schools come either from the fleet or directly from recruit training schools. Whether the fleet personnel perform better or poorer, in relation to ability, than do the personnel who come from recruit training centers is a question of considerable importance for selection procedures. The results of the study indicate that the fleet subjects earned higher grades in a Torpedoman's Mates School than did recruit subjects who had similar scores on tests from the Navy Basic Battery. Although the factors of age and education were significantly correlated with school grades, these factors did not appear to account for the superior performance of the fleet subjects.