Maintaining the high level of operational readiness of the army requires ensuring constant high technical readiness of its technical equipment. The reliability of a technical device results from its design and operational features, and in the operation phase it depends solely on the efficiency of the logistics supply system, service, and diagnosis. The principles of implementing these processes and the functioning of the systems are determined by the adopted equipment exploitation strategy. The study presents the results of the assessment of the technical equipment maintenance system in the Polish Army. Methods, procedures and tools for obtaining data to achieve the set goal, methods of data processing, and analysis of the obtained information were characterized. Information and data characterizing the functioning of the maintenance system were obtained as a result of the use of interview techniques with experts with theoretical and practical knowledge about the functioning of the system in the armed forces, using observation techniques, analysis of operational documentation in paper form as well as collected in IT systems. The method of surveying of two groups of experts, participants of the logistics course involved in the implementation and managing the operation of the equipment was of fundamental importance in the research process. IT tools such as MS Excel, MatLab and Statistica were used to develop the obtained numerical and linguistic results. The study determined the parameters of descriptive statistics, histograms and probability distributions and used fuzzy logic. As a result of the study, the reasons for the currently not fully satisfactory level of operation of the equipment maintenance system were revealed and possible solutions were identified to increase the efficiency and effectiveness of the system, and thus the technical readiness of the equipment.