The second enclosure to the study of attrition at the five federal service academies reviews 87 related studies, about half of all those done by, for, or about the academies in the last 10 years. One general observation is that relationships have been established between attrition and student characteristics, whereas the same is not true in studies of attrition and academy environment. It is felt to be possible that some of the dropouts are making an important comment on the academy environment's ability to produce good career officers. Variables that are considered by the 87 studies include: student ability at entry, biographical characteristics, personality characteristics, external effects (such as reference group influences, available alternatives, national events, and societal effects), academy environment, and the academy environment as seen by others. (Editor/MSE)