This article examines the opinions of students of military classes concerning aspects of Poland’s national security. The main problem of the study is contained in the following question: How do students of military classes describe selected conditions of Poland’s national security? Thus, the objective of the article was to diagnose the opinions of students of military classes about national security in Poland. The study involved an analysis of the following aspects of Poland’s national security in the opinion of participating students of military classes: social attitudes that are conducive to the strengthening of national security, factors affecting national identity, and threats to national security. An analysis of the results of the study also made it possible to determine the source of the respondents’ knowledge about national security. The article briefly looks at the origins of military classes and describes the research methodology, and then presents a diagnosis of the opinions of students of military classes about selected aspects of Poland’s national security: social attitudes conducive to the strengthening of national security, factors shaping national identity, and threats to national security. The sources of the respondents’ knowledge about national security are indicated too. In the conclusion, answers to the research problems were provided and the need for further studies of the matter in question was identified.