The latest edition is the sixth edition. This book focuses on teaching students basic theoretical knowledge such as military thought, strategic environment, national defense, military high technology, information warfare, etc. according to the contents stipulated in the syllabus of military courses issued by the Ministry of Education, the General Staff Department and the General Political Department, combined with the characteristics of school teaching reform, and following the scientific, targeted and guiding teaching principles. So as to improve students' national defense concept, national defense consciousness and national defense spirit, help them master military skills and improve their physical fitness.