Abstract: The subject of the research is specific nature of national specificity manifestation of the lacunae belonging to different parts of speech. The purpose is to describe the thematic groups of Russian-English verbal, substantive and attributive lacunae relating to the military sphere. To bring to light the national peculiarity the system of formalized indexes is used. The research novelty is connected with revealing and testing new formalized parameters within the groups of lacunae that have not been studied from such perspective. In the course of the research we made use of the following methods: the continuous sampling method from a lexicographical source, the quantitative analysis method, comparative analysis and comparative-parametric method of linguistic research. The theoretical importance of the research is determined by the fact that methods of comparative description have got further amplification. The indexes are used to determine quantitative characteristics of national peculiarity. The results we obtained can be utilized in practice of teaching professionally oriented translation, comparative typology of the Russian and English languages and be used for further inter and intralinguistic research. Through the prism of the indexes conclusion about the degree of the groups’ national specificity is drawn.