The size is not uniform. According to the people's consultation, the national level is the largest and the provincial and municipal levels are smaller. This brand is of different sizes. National defense education is a social activity aimed at safeguarding national sovereignty, territorial integrity and security. The contents include imparting ideas, knowledge and skills related to national defense and enhancing national defense concepts and capabilities. National defense education is a basic education for all citizens, involving all aspects, rich in content and wide in scope.