Military science fiction is a popular sub-genre of science fiction that involves the use of military action, technology, and tactics in space warfare or on alternate worlds. There are many synonyms and related terms for military science fiction, such as space opera, military SF, military fantasy, futuristic war fiction, and paramilitary fiction. Each term has its own connotations and nuances, but they all share a focus on the military and its role in futuristic or fantastical settings. Some popular authors of military science fiction include Robert A. Heinlein, Orson Scott Card, Joe Haldeman, and David Weber. Whether you prefer action-packed space battles or gritty ground warfare, military science fiction offers an exciting and imaginative world to explore.