Various threats to national interests are very difficult to identify and analyze with conventional approaches. To deal with the development of increasingly diverse threats, Indonesia needs to reorganize its strength. The purpose of implementing national defense is to maintain and protect the sovereignty of the state, the territorial integrity of Indonesia, and the safety of the entire nation. This study aimed to discuss the role of reserve components to achieve this goal as the national defense function is carried out by utilizing all the potential of national resources and national facilities and infrastructure as an important part of the national defense component as well as being used for the welfare of the people. This study uses a qualitative approach.