The realm of privatization of security and the consequent existence of private military companies is an important constitutive element of security with regard to international relations. This phenomenon is most strongly developed in the Anglo-Saxon world. However, in the case of the French Republic, we can observe significant developmental and functional disparities. This paper examines externalization processes in the context of the French approach to the legitimacy, legality and territoriality of the privatization of security functions of the state and explains the different causes of their development. It discusses the main aspects of externalization, defines the typical activities of French private military companies, describes their strengths and weaknesses and outlines the problems and possible solutions that lie before the French, which cannot be ignored in the future. Finally, this paper describes the most important French private military companies and their characteristics.