In response to increased attrition at federal service academies including Department of Defense and Coast Guard Academies, a multidimensional study was conducted of proposed theoretical longitudinal attrition models. The primary goal was to determine if persisters and resignees at the Coast Guard Academy could be differentiated based on a multidimensional measure of social and academic integration and to determine if the effect of such a measure was time-dependent. The study sample consisted of 281 cadets who entered the Coast Guard Academy class of 1991 and remained at the end of the fall freshman term. Measures of academic and social integration included grade-point averages, adaptability for service ratings, officer evaluation scores, conduct ratings, and dates of resignation. Results of the study suggest that cadets' sense of integration may be viewed as evolving over time and that measures of integration have their most profound effects in the immediate subsequent time period, for instance, fall freshman measures provided a practical means to discriminate between persisters and resignees only during the time period immediately following their reporting. The overall conclusion of the study was that the measures of social and academic integration are time-dependent, as the ability to predict group membership utilizing the vector of academic and social integration outcomes wanes with time. Included are 2 figures, 5 tables, and 25 references. (JB)