The purpose of this article is to introduce Psychosemantics of Types of Military Stress of Combatants: we mean Chronic constant (or prolonged) stress and Acute situational stress of combatants with Post-traumatic stress disorder. Methods of the research. The following theoretical methods of the research were used to solve the tasks formulated in the article: a categorical method, structural and functional methods, the methods of the analysis, systematization, modeling, generalization. The experimental method was the method of organizing empirical research. The results of the research. We proved, that combatants with Chronic constant (or prolonged) stress also observed variability in the occurrence and development of a painful emotional state, but, as a rule, at the first stage there was an accumulation of emotional tension, which, due to the interaction of certain personal characteristics and situational influences, did not find a response. We understood, that the main disorders of the servicemen’s mental activity are related to the experience that traumatizes the psyche and which is caused by military conditions, but their degree largely depends on the totality of the reaction to this factor of the entire unit. The collective reaction has a strong influence on the discipline and organization of military units. Conclusions. Therefore, it should be noted that Post-Traumatic Stress Disorders occur in a case of combatants as a delayed or protracted reaction to a Psycho-Traumatic Stress Event or a situation of an exclusively threatening or deadly nature (combat operations, watching the violent death of others, the role of a victim of torture, being in captivity, etc.). In its essence, Post-Traumatic Stress Disorder is an appropriate reaction of a mind and a body to a powerful emotional stimuli of a stressful situation that occurred.