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in Belgrade, Military Academy he actualization of the importance of the air defence system capabilities in performing tasks of defence system, both in peace and in war, is the result of changed conditions of warfare in contemporary armed conflicts and other conflict situations. In contemporary armed conflicts, air and air defence forces realize strategic effects through their operations and have decisive influence on the outcome of armed conflicts. In peacetime, these forces are the main factor in diverting and eliminating potential asymmetric threats from the air space. In addition to the introduction and conclusion, the paper consists of three more parts. The first part deals with a conceptual definition of air defence system. The second part gives an overview of the importance of defence system and the development of anti-missile, i.e. anti-cosmic defence system of NATO alliance and the Russian Federation. The third part describes prospects of the development of organizational structures and objectives of the development of air defence system of the Republic of Serbia.

of the public with ecological problems escalated during the last decades of the 20 th century, and it has incredibly increased during this century, as well. Ecological security is a certain contemporary phenomenon that is present in diverse organizational units. This field is full of uncertainty and risks. From the moment of realizing that ignorance of ecological threats violates personal and collective security to a considerable extent and causes long-term and often catastrophic consequences to the environment, the need for ecological enlightenment has been recognized in many modern systems. The military organizations, which are the most complex security structures, are not an exception. This paper deals with security ecological risks in the military organizational systems and it emphasizes possibilities for effective action through constructive use of achievements of the modern digital age.