story traces Rico's transformation from a boy into a soldier, while exploring issues of identity and motivation, and traces his overall moral and social development, in a manner identified by commentators as similar to many stories about German soldiers in World War I. Rico's transformation has been likened to the common narrative within stories with military themes by scholar H. Bruce Franklin. This typical narrative is that of a sloppy and unfit civilian being knocked into shape by tough officers, whose training is "calculated sadism" but is depicted as fundamentally being on the right side. The letter Rico receives from Dubois, partly responsible for Rico "crossing the hump" with his training, is shown as a turning point in his development. The classroom scenes embedded in the story serve to explain Rico's adventures, and highlight his reactions to events around. A notable example is the execution Rico is forced to witness after a deserter from his unit murders a young girl; Rico is uncertain of his own reaction until he remembers a lecture by Dubois in which the latter argues that "moral sense" derives entirely from the will to survive. The concept of the American frontier is also related to the coming-of-age theme. Young protagonists across Heinlein's novels attain manhood by confronting a hostile "wilderness" in space; coming-of-age in a military, alien context is a common theme in Heinlein's earlier works as well. Rico's coming-of-age has also been described as being related to his relationship with his father; the journey "outward" through the novel also contains a search for Rico's childhood and a reunion with his estranged parent. Moral decline Starship Troopers also critiques US society of the 1950s, suggesting that it led young people to be spoiled and undisciplined. These beliefs are expressed through the classroom lectures of Dubois, Rico's teacher for History and Moral Philosophy. Dubois praises flogging and other types of corporal punishment as a means of addressing juvenile crimes. It has been suggested that Heinlein endorsed this view, although the fact that Dubois also compares raising children to training a puppy has been used to argue that Heinlein was making use of irony. The story is strongly in favor of corporal punishment and capital punishment, as a means of correcting juvenile delinquents, part of a trend in science fiction which examines technology and outer space in an innovative manner, but is reactionary with respect to human relationships.