Such plots were more common. Usually, the protagonist's country or organization was invaded or threatened by external forces. In order to protect the country or himself and his people, the protagonist had to join the army or mercenaries to participate in the battle with other members and finally win. In the novel, the protagonist usually had a certain amount of military knowledge and skills, such as flying a plane, driving a military vehicle, etc., and would also receive the support and help of other brothers. In addition, the protagonist's organization or country may also provide certain assistance and support, such as weapons, equipment, and personnel. In this case, the protagonist may face various challenges and dangers such as battles, terrorist attacks, enemy infiltration, etc. However, he or she will eventually grow into an excellent soldier and leader through continuous training and fighting to win victory and peace for the country and the people.