This study aims to examine the change of mental health status on cadets during the four-year period of attendance at Korea Military Academy. The results of MMPI and MMPI-2 that 201 cadets committed for three times are intensively analysed. Cadets took MMPI at the entrance exam, and took both of tests on the junior year with a five-day interval in a random order. Lastly, MMPI-2 is examined for the senior cadets. Repeated Measures Analysis of Variance demonstrates the results of junior cadet's MMPI have lower L and K scores, but higher Pa, Pt and Si sores than those of MMPI at the entrance exam. MMPI-2 in the senior year have high L, K, Hs scores, but low Pa, Ma and Si scores than MMPI-2 in the junior year. This results mean that junior cadets had experienced much psychological distress compared to the period which they entered. However, the results of senior cadets show they become extroversive, stable, and more hypochondriac than before. Overall, the findings suggest that mental health state or personality functioning exhibits considerable stability during four-years, yet can change in specific ways. Implications of this study are discussed and are compared with previous works. Also, limitations of this study and directions of future research are provided.
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