Although the importance of reserve forces has been emphasized again since the outbreak of the Ukraine War, there is a serious shortage of so-called mid-level officers such as field officers, non-commissioned officers, sergeants, and sergeant s in the Army. This is because, according to related laws such as the Military Personnel Mannagement Act, mid-level exe cutives who have served for more than 20 years can choose to retire. To solve this problem, we studied recent papers spa nning 10 years from April to July 2023. As a result of the study, first, mid-level executives must serve in the reserve forc es for at least 5 years after expiration of active duty service. Second, the reserve force promotion system must be reorgan ized to eliminate restrictions on number and rank. In addition, the significance and implications of the study and future dir ections were discussed.