The article deals with the combat rations used in the Army of the Czech Republic to ensure the feeding of soldiers in field training. The author describes the division according to the STANAG 2937 standard and points to the problem arising from the storage of combat rations under extreme climatic conditions. In these conditions, microbiological, chemical and biochemical changes occur on some food components. For this reason, the article describes and suggests some changes in the composition of combat rations, depending on the area of possible deployment of Czech army forces.