Introduction. Ukraine's choice of the European way of development creates a united educational environment – it leads to the outflow of abroad for the studying of the most trained pre-conscripts youth, who wants to get education in European countries with the prospect of having work and citizenship. The Operation of the united forces in the East of Ukraine, defense of the state requires the provision of human resources, the formation of a military personnel reserve. Providing of the Armed Forces of Ukraine with human resources is becoming an actual problem.Purpose. Analysis of factors and trends affecting the training of pre-conscripts.Methods. Summarization and analysis of information and analytical materials on open and electronic (Internet) sources.Results. Educational institutions become the only center for training young people in the theoretical, practical, physical and moral-psychological terms of future military activity.Detection of the influence of external and internal factors on the preparation of pre-conscripts youth:military confrontation in the East;socio-economic stagnation in the state;large-scale labor and stationary migration;reduction of populationlack of spirituality and morality in society;reduction in the birth rate of the population.To the negative challenges of labor and stationary migration that affect the mobilization of youth, one can note:change in the number, structure of the population as a result of the transition of labor migration into a permanent one;process of aging of the nation, change of age, sexual, family, ethnic composition;weakening of family ties, the instability of marriages, the weakening of social forces, which negatively affects fertility, the development of seven, causes significant economic losses;formation in the youth of a stereotype, mentality, which achieved the achievement of living standards can be through labor travel abroad;formation of the psychology of right nihilism among the population.Finding the best ways to prevent the impact of these challenges and make appropriate decisions requires the creation of a database of informational and sociological support for pre-conscripts youth, the methodology for analyzing sociological information, the procedure and nature of its use are very important for the preparation of a military reserve, not only during the period of military confrontation but also in the future.The analysis of the current state of military reserve preparation (pre-conscription, reckless youth) to protect the state has revealed a number of problems, the presence of potential challenges that require a practical solution:minimizing the social exclusion of young people from the Ukrainian educational space;creation of conditions for equality of educational chances of citizens of the country;optimization of the network of general educational institutions (military-sports direction), which gives an increase in the number of young people ready to fulfill their duty to protect the Motherland;strengthening of professional orientation of youth, popularization and promotion of military profession;development and formation of new standards of military applications that will meet the requirements of time;intensifying the study of the current state of national-patriotic education of children and youth, organization of its systematic, ongoing monitoring.Originality. The identification of contradictions, problems, challenges and their impact on the preparation of pre-conscription youth for the Armed Forces of Ukraine in the long term perspective provides an opportunity to identify priorities, search for the control of the effects of an optimal strategy in the field of mobilizing human potential, and creating a military reserve. Adjustment of managerial decisions should be aimed at achieving the final result – quantitative and qualitative training of military specialists to protect the state.Conclusion. The level of combat readiness and combat capability of the Armed Forces of Ukraine depends on the quality of pre-conscripts training, their education, healthy lifestyle, and the prevention of deviant behavior.Preparation of pre-conscripts youth, military reserve depends on the population size, the quality of education, which determines the development of science, technology, weapons, their use all affects the defense of the state.