At the modern level of society development, on the one hand its Armed Forces are the object that requires the defense from unfavourable effect of environmental factors, on the other hand they are potential source of ecology worsening. The problem of ensuring ecological safety in the army and navy becomes urgent. In order to solve this problem first of all it is necessary to develop the conceptual bases of military ecology. Among all medical sciences the military hygiene by purpose, tasks, subject and objects is the most close to military ecology.