Abstract: The subject of this research is the events and factors that have direct impact on the establishment, development, and activity of the private military companies (PMC) of the United States in terms of modern warfare in other countries. The goal of this work lies in analysis of the United States experience in use of the private military companies for achieving the military objectives alongside its effectiveness; determine the areas for future research of the activity of PMC; reveal the potential of international community aimed at regulation of the private military business. Attention to the legal facet of the issue substantiates the need for legislation and oversight for the action of PMC, which requires attention to the issues of ethical nature. Conclusions can be made that as long as the activity of the PMC is not meticulously studied and introduced into the legal field, the moral-ethical issues and problems of criminal punishment for the acts committed will remain unsolved. The services of PMC will continue to be in demand in the future by not only the U.S. government, but also private organizations and transnational corporations for achieving their personal goals.