Starship Troopers is a military science fiction novel written by Robert A. Heinlein. It is set in a future where humanity is at war with an insectoid alien species known as the 'Bugs.' The story follows Juan Rico, a young soldier who joins the Mobile Infantry to fight against the Bugs. Starship Troopers explores themes of duty, citizenship, and the nature of war. The book is known for its controversial political and philosophical ideas, as well as its intense action sequences.