Since the Cold war, many countries in the world have reduced the number of their military personnel. However, it is also factual that regional conflicts have been incessantly occurring around the world. In turn, specific governmental policies are also needed in certain countries. Recently, a resolution growingly accepted in the advanced countries is the outsourcing of the resources and services of private military companies, which benefits for governments to manage their military force efficaciously. The utilization of private military force, however, may potentially generate ethical and practical issues because of the non-specified international codes to regulate private military companies, the political misuse of private personnel without concerning the loss of public military employees in danger zones, the safety of private personnel in the field, and the possibility of genocide. Prior to accept a private military companies which may be adequate in the environment of the Korean military, it is necessary to review previous cases of foreign countries. In addition, it is also needed to determine the plausible boundaries of the operation of private military companies with taking into consideration of the situations of the Korean military and private business. Finally, the systemic governmental support is requested in order to foster the business of private military.