This paper examines the involvement of the US Armed Forces in performing domestic functions in the course of the War on drugs, the government’s long-running campaign to combat drug trafficking and drug use. The article traces the process of the gradual expansion of the military roles in supporting civilian law enforcement agencies. The author describes the growing scope of tasks related to border control, drug smuggling interdiction and disruption of trafficking routes. The article identifies the peculiarities of political decision-making in the adoption of a new function for the army. In particular, it describes the reasons that led lawmakers to adopt amendments to the basic law that historically limited military’s involvement in law enforcement, the Posse Comitatus Act. It finds that, in the context of the growing role of the armed forces in the War on drugs, the implementation of new tasks was often not supported by the Army's senior command and officer corps. Although the US military eventually took over command of operations on the southern borders, improving command and control, while technically strengthening other agencies, the overall success remained questionable. Methods of smuggling drugs across the border were constantly evolving, and the cartels’ ability to counter high-tech capabilities was improving. Today, the theoretical combination of these methods with the targeted sabotage activities of the aggressor country creates new risks for Ukraine’s security sector. This threat raises the question of expanding the possible involvement of the Ukrainian Armed Forces in supporting the activities of the State Border Guard Service. At the time of writing, the issue of strengthening control of the southern border remains at the center of the political agenda in the USA, the article additionally reveals the historical context and significance of this problem for American society. It is proved that when involved in countering a new non-military threat to national security, effective reorganization of the Armed Forces to fulfill new tasks requires a balanced political approach and a reasonable distribution of military assets. Keywords: national security, border security, internal threat, internal security, armed forces, management system, drug trafficking
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