The paper reveals essential characteristics of military personnel adaptation to the conditions of service in the army. The author believes that to understand the essence of adaptation it is necessary to understand modified, stressful living conditions and activities causing the inclusion of physiological, psychological, and physical functional reserves of the organism, some problems of adaptation: the relationship between commanders and soldiers, the relationship between the older soldiers and recruits, the commanders of insubordination, aggressive behavior, defiant behavior and factors of maladjustment: the low stress resistance of the organism, physiological reserves, poor physical fitness, lack of personal and psychological potential, non-acceptance of new rules and conditions of life, low training and combat training, unformed value-semantic orientation. A sociological study revealed the following problems of socio-psychological adaptation: insufficient psycho-pedagogical competence of commanders in matters of socio-psychological adaptation; a lack of specialists of social work; a lack of individual psychological assistance to servicemen who have difficulties of adaptation; a lack of the programme of adaptation work; insufficient development of individual methods, techniques and technologies of work; a lack of analysis of work; insufficient work with the team. The author sees the prospect of the research in the development of methods and techniques that can help to successfully support military personnel during their adaptation.