No comprehensive survey has been made of the operations of the senior service college libraries since 1955; likewise, relatively little scientific research has been conducted in the field of librarianship in the institutions of higher military education. This study is in two parts and deals with both matters. Part one presents a descriptive survey of the five senior service college libraries and includes a comparative analysis of selected characteristics. The libraries' staffs, organizations, missions, and functions are reviewed as well as holdings, budgetary data, use of library committees, and special features. The second part of the study is a report of a scientific experiment which tests the hypothesis that a relationship exists between course requirements and library usage at the Army War College. Emphasis is on a detailed methodology with a study design and precise scientific treatment of data that consists of identification of the independent and dependent variables, random sampling, and analysis of variance to accept or reject a null hypothesis. The data supports the hypothetical prediction of the existence of a probable relationship.