Lean management is used more and more in all spheres of the business world, and the advantages of this type of management have also been recognized in different armies of the world. Using Lean, a better flow of materials is achieved, more efficient use of resources, and in combination with Six Sigma, the number of defects and other unwanted outcomes is reduced. In other words, by using Lean Six Sigma, existing processes are improved and their efficiency is increased. In addition, a large part of Lean management is the continuous improvement that is established by using Lean tools and it constantly brings new progress, increases efficiency and keeps the company relevant compared to the competition. There are many examples of different militaries using these principles and realizing significant savings and improving their capabilities. In the same way, the Croatian army can use Lean to improve its industry, achieve more efficient use of resources and acceleration of all maintenance and production processes.