Starship Troopers, written by Robert A. Heinlein, is a classic space war science fiction novel that explores themes of militarism, duty, and the nature of citizenship. Set in a future where humanity is at war with a highly advanced alien species known as the Bugs, the story follows Juan Rico, a young recruit who joins the Mobile Infantry to fight against the alien threat. As Juan undergoes rigorous training and participates in brutal battles, he grapples with the moral complexities of war and the responsibilities of being a soldier.