The article presents the basic conditions for conducting modernization works on weapon systems used in the land forces. The time, reliability, and functional parameters of equipment used in the opposing party's armies were adopted as the criterion of modernization. In this process, the conditions related to the effectiveness of modernization work are understood as obtaining benefits concerning the expenditures. Special attention in the modernization process was paid to modernization resulting from the reliability function of the improved system and its readiness to perform tasks. Modernization conditions resulting from the serial and parallel structure were presented. In the final part of the article practical needs of modernization of small arms and selected types of artillery weapons, including missiles, are presented. The modernization process should be carried out in the national defense industry (in the domestic industrial defense potential). This industry should have modern technologies of modernization.
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