This book is an original encyclopedia of military targeting children from 6 to 15 years old. It is compiled with recognition of children's acquisition characteristics, guaranteeing authority and comprehensiveness while sparking children's interests in reading the book. It includes four sections: a brief introduction to national defense, knowledge of military uniform, distinguishing weapons and military equipment, and an introduction to unique wars and battles. The book covers 118 themes, nearly 500 knowledge points, more than 1,000 images, and about 20 video clips accessed via QR codes. All the resources provide in-depth military knowledge to children and are easy to understand. Also, they allow children to see the solemnity and courage of Chinese soldiers.