Objective: The current research was carried out with the aim of  pathology f the defense equipment maintenance system in the popular  units of a military organization and analyzing the gap between the current and desired situation.
Method: According to the purpose, this article is an applied research, and from the point of view of the way it was collected, it is considered descriptive and analytical, which is carried out with a survey method. The sustainable resistance maintenance strategy was chosen as the based model and with its development and localization, a questionnaire was distributed to measure the importance and performance of the factors included in the aforementioned list and distributed among the sample group. The statistical population includes 120 people from the deputies of readiness and support, network managers and munitions repair experts in the investigated units. The statistical sample of the research is 92 people who were selected by stratified sampling. Data analysis was done using one-sample t-test, Friedman test and importance-performance gap analysis.
Findings: The findings of the research indicate the existence of pathology in the dimensions of "training and human resources", "maintenance and repair management processes and systems", "management of maintenance and supply of parts and consumables", "budget and credit management" and "non-unit maintenance and repairs". "In the current system of keeping weapons in the units under study. The most problem was observed in the area of ​​budget and credits.
Conclusion: Based on the findings of the research, it was concluded that the commanders and maintenance  department managers in the studied units should improve the salary structure and provide the required spare parts in order to provide enough spare parts for middle level maintenance of the military equipment more than any other issue.