This thesis analyzes the behavior of Korean senior officers corroboratively. The subject of research is a group of senior officers who were graduated from the Korea Military Academies of three armed forces, promoted to colonel at their first screen, and served for the duration of active duty on 18-22 years. The study reviews a correlation between the academic record and military promotion, and also between it and the duration of active service. Tri-dimensional leader effectiveness model, which P. Horsey and K.H. Blanchard developed to analyze LEAD (lead effectiveness and adaptability description), is used to evaluate the basic leader behavior styles.