Problems of logistics support of weapon systems in their life cycle operation and support phase, especially considering its modernization are presented in the paper. In the introduction inevitability of the modernization process of crucial weapon systems was emphasized. Furthermore, the concept of weapon system, life cycle of the weapon system and modernization of weapon systems where presented. A general description of a model of the process of creating the plan of technical modernization of the Polish armed forces was also presented. The main part of the article presents the areas of logistics that should be newly tailored to the needs of the modernized weapon system. These basic areas include: processes of operation and maintenance, material and technical supplies, staff acquisition, availability of service devices, creation of databases, organization of trainings, computerization, logistics infrastructure, dedicated transport means. The main conclusion of the article is to emphasize the fact that the modernization of weapon systems entails not only the costs of modernizing a specific type of weapon (tank, infantry fighting vehicle) but also the costs of logistic support in operation and maintenance phase of their life cycle.Keywords: Weapon system, life cycle, modernization, logistic
© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.