Military science fiction is a subgenre of science fiction that focuses on the use of military tactics, technology, and organization in futuristic or speculative settings. It often explores themes such as warfare, strategy, and the impact of military actions on society. Common elements include advanced weaponry, space battles, and the experiences of soldiers, often set against the backdrop of interstellar conflicts or alien invasions. This genre frequently features space marines, robotic soldiers, and alien species, highlighting the complexities of combat in diverse environments. Notable works include Robert A. Heinlein's "Starship Troopers" and David Weber's "Honor Harrington" series, which examine the moral and ethical dilemmas faced by military personnel.