This study is to present non-traditional security threats and measures to establish the role of the military. To this end, a review of the concept of non-traditional security threats and the fields and scope that the military can support must be conducted in parallel. This would suggest the direction of development of all systems and capabilities to carry out the new defense role, and provide a clues for the direction of revision of all laws. The field and scope that the military can support can be divided into areas that perform a preventive role in the field of disaster and terrorism, the field that performs its mission as an initial agency in the event of a disaster or terrorism, and damage recovery and reconstruction activities. In order to carry out these re-established military roles and missions, it is necessary to discover the scope and field of missions that can achieve synergy effects with wartime missions, and improve the system and amend laws and regulations.