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Military science fiction is a subgenre of science fiction that depicts the use of science fiction technology, including spaceships and weapons, for military purposes and usually principal characters who are members of a military organization, usually during a war; occurring sometimes in outer space or on a different planet or planets. It exists in a range of media, including literature, comics, film, television and video games.
A detailed description of the conflict, belligerents (which may involve extraterrestrials), tactics and weapons used for it, and the role of a military service and the individual members of that military organization form the basis for a typical work of military science fiction. The stories often use features of actual past or current Earth conflicts, with countries being replaced by planets or galaxies with similar characteristics, battleships replaced by space battleships, artillery replaced by lasers, soldiers replaced by space marines, and certain events changed so the author can extrapolate what might have occurred.
Traditional military values of courage under fire, sense of duty, honor, sacrifice, loyalty, and camaraderie are often emphasized. The action is typically described from the point of view of a soldier in a science fictional setting of or near battle.  Typically, the technology is more advanced than that of the present and described in detail. In some stories, however, technology is fairly static, and weapons that would be familiar to present-day soldiers are used, but other aspects of society have changed. Technology may not be emphasized in such stories as much as other aspects of the characters' military lives, cultures, or societies. For example, women may be accepted as equal partners for combat roles, or preferred over men.
When the "extravagan[t]" depictions of war in space operas faded along with pulp fiction more generallly, military science fiction developed with a "more disciplined and more realistic notion of the kind of armies which might fight interplanetary and interstellar wars, and the kinds of weapons they might use". 
In many stories, the usage or advancement of a specific technology plays a role in advancing the plot, such as deploying a new weapon or spaceship. Some works draw heavy parallels to human history and how a scientific breakthrough or new military doctrine can significantly change how war is fought, the outcome of a battle, and the fortunes of the combatants. Many works explore how human progress, discovery, and suffering affect military doctrine or battle, and how the protagonists and antagonists reflect on and adapt to such changes.
Military science fiction is also part of the "military and popular culture" subject field. 
Many authors have either used a galaxy-spanning fictional empire as a background for the story, or have explored the growth and/or decline of such an empire. The capital of a galactic empire is sometimes a "core world," such as a planet relatively near a galaxy's centrally-located supermassive black hole, which has advanced considerably in science and technology compared to current human civilization. Characterizations of these empires can vary wildly from malevolent forces that attack sympathetic victims, to apathetic or amoral bureaucracies, to more reasonable entities focused on social progress.
A writer may posit a form of faster-than-light travel in order to facilitate the enormous scale of interstellar war. The long spans of time (e.g., decades or centuries) required for human soldiers to travel interstellar distances, even at relativistic speeds, and the consequences for the characters, is a dilemma examined by authors such as Joe Haldeman and Alastair Reynolds. Other writers such as Larry Niven have created plausible interplanetary conflict based on human colonization of the asteroid belt and outer planets by means of technologies utilizing the laws of physics as currently understood.[ citation needed ]
Several subsets of military science fiction share characteristics of the space opera subgenre, concentrating on large-scale space battles with futuristic weapons in an interstellar war. Many stories can be considered to be in one or both the military science fiction and space opera subgenres, such as The Sten Chronicles by Allan Cole and Chris Bunch, Ender's Game series by Orson Scott Card, Honorverse by David Weber, Deathstalker by Simon R. Green, and Armor by John Steakley.
At one extreme, a military science fiction story can speculate about war in the future, in space, or involving space travel, or the effects of such a war on humans; at the other, a story with a fictional military plot may have relatively superficial science fictional elements. The term "military space opera" may occasionally denote this latter style, as used for example by critic Sylvia Kelso when describing Lois McMaster Bujold's Vorkosigan Saga .  Examples that feature aspects of both military science fiction and space opera include the Battlestar Galactica franchise and Robert A. Heinlein's 1959 novel Starship Troopers .
A key distinction of military science fiction from space opera is that space operas focus more on adventurous stories and melodrama, while military science fiction focuses more on warfare and technical aspects. The principal characters in a space opera are also not military personnel, but civilians or paramilitary. Stories in both subgenres often concern an interstellar war in which humans fight themselves and/or nonhuman entities. Military science fiction, however, is not necessarily set in outer space or on multiple worlds, as in space opera and the space Western. 
Both military science fiction and the space Western may consider an interstellar war and oppression by a galactic empire as the story's backdrop. They may focus on a lone gunslinger, soldier, or veteran in a futuristic space frontier setting. Western elements and conventions in military science fiction may be explicit, such as cowboys in outer space, or more subtle, as in a space colony requiring defense against attack out on the frontier.  Gene Roddenberry described Star Trek: The Original Series as a Space Western (or more poetically, as " Wagon Train to the stars").  The TV series Firefly and its cinematic follow-up Serenity literalized the Western aspects of the space Western subgenre as popularized by Star Trek: it features frontier towns, horses, and a visual style evocative of classic John Ford Westerns.   Worlds that have been terraformed may be depicted as presenting similar challenges as that of a frontier settlement in a classic Western.  Six-shooters and horses may be replaced by ray guns and rockets. 
A "thematic subdivision" of MSF are works where "ex-military protagonists [are] drawing on their battle experience for tough and violent operations in (more or less) civilian life", typically in a law enforcement setting. Some examples include Richard Morgan's Takashi Kovacs book such as Altered Carbon (2002) and Elizabeth Bear's Jenny Casey books, such as Hammered (2004). 
Precursors for military science fiction can be found in "future war" stories dating back at least to George Chesney's story "The Battle of Dorking" (1871).  Written just after the Prussian victory in the Franco-Prussian War, it describes an invasion of Britain by a German-speaking country in which the Royal Navy is destroyed by a futuristic wonder-weapon ("fatal engines").
Other works of military science fiction followed, including H.G. Wells's "The Land Ironclads".It described tank-like "land ironclads," 80-to-100-foot-long (24 to 30 m) armoured fighting vehicles that carry riflemen, engineers, and a captain, and are armed with semi-automatic rifles.
Eventually, as science fiction became an established and separate genre, military science fiction established itself as a subgenre. One such work is H. Beam Piper's Uller Uprising (1952) (based on the events of the Sepoy Mutiny). Robert A. Heinlein's Starship Troopers (1959) is another work of military science fiction, along with Gordon Dickson's Dorsai (1960), and these are thought to be mostly responsible for popularizing this subgenre's popularity among young readers of the time.[ citation needed ]
The Vietnam War led to the "polarization of the sf community", which can be seen in the June 1968 issue of Galaxy Science Fiction , in which one page of pro-war sf authors listed their names and on another page, anti-war sf authors put their names.  The Vietnam War has been noted by the Encyclopedia of Science Fiction as having impacted anthologies such as In the Field of Fire (1987) and novels such as The Healer's War (1988) by Elizabeth Ann Scarborough and Dream Baby (1989) by Bruce McAllister.  The Encyclopedia of Science Fiction states that the Vietnam War's influence can be seen indirectly in novels such as Joe Haldeman's The Forever War (published in Analog over 1972–1975) and Lucius Shepard's Life During Wartime (1987).  The Vietnam War resulted in veterans with combat experience deciding to write science fiction, including Joe Haldeman and David Drake. Throughout the 1970s, works such as Haldeman's The Forever War and Drake's Hammer's Slammers helped increase the popularity of the genre.  Short stories also were popular, collected in books such as Combat SF , edited by Gordon R. Dickson. This anthology includes one of the first Hammer's Slammers stories, as well as one of the BOLO stories by Keith Laumer and one of the Berserker stories by Fred Saberhagen. This anthology seems to have been the first time these stories specifically dealing with war as a subject were collected and marketed as such.[ citation needed ] The series of anthologies with the group title There Will be War edited by Pournelle and John F. Carr (nine volumes from 1983 through 1990) helped keep the category active, and encouraged new writers to add to it.[ citation needed ]
David Drake wrote stories about future mercenaries, including the Hammer's Slammers series (1979), which follows the career of a future mercenary tank regiment. Drake's series which "helped initiate a fashion for sf about mercenaries", including The Warrior's Apprentice (1986) by Lois McMaster Bujold. 
A twist was introduced in Harry Turtledove's Worldwar series depicting an alternate history in which WWII is disrupted by extraterrestrials invading Earth in 1942, forcing humans to stop fighting each other and unite against this common enemy. Turtledove depicts the tactics and strategy of this new course of the war in detail, showing how American, British, Soviet, and German soldiers and Jewish guerrillas (some of them historical figures) deal with this extraordinary new situation, as well as providing a not unsympathetic detailed point of view of individual invader warriors. In the war situation posited by Turtledove, the invaders have superior arms, but the gap is not too wide for the humans to bridge. For example, the invaders have more advanced tanks, but the German Wehrmacht's tank crews facing them – a major theme in the series – are more skilled and far more experienced.
The Encyclopedia of Science Fiction lists three notable women authors of MSF: Lois McMaster Bujold; Elizabeth Moon (particularly her Familias Regnant stories such as Hunting Party (1993)), and Karen Traviss. 
Several authors have presented stories with political messages of varying types as major or minor themes of their works.
David Drake has often written of the horrors and futility of war. He has said, in the afterwords of several of his Hammer's Slammers books (1979 and later),[ citation needed ] that one of his reasons for writing is to educate those people who have not experienced war, but who might have to make the decision to start or endorse a war (as policymakers or as voters) about what war is really like, and what the powers and limits of the military as an instrument of policy are.
David Weber has said:
For me, military science fiction is science fiction which is written about a military situation with a fundamental understanding of how military lifestyles and characters differ from civilian lifestyles and characters. It is science fiction which attempts to realistically portray the military within a science-fiction context. It is not 'bug shoots'. It is about human beings, and members of other species, caught up in warfare and carnage. It isn't an excuse for simplistic solutions to problems. 
In 1980 and 1981, two science fiction authors inspired President Ronald Reagan's vision for a Strategic Defense Initiative in which satellites would be set up to shoot at nuclear missiles.  The two authors were Larry Niven, the author of the Ringworld series, and Jerry Pournelle. Along with like-minded colleagues, they formed a committee to lobby the United States on space issues and influence Reagan's space policies. Pournelle advocated a "robust, technocratic military state".  In addition to Pournelle's science fiction writing, he wrote a "paper for the Air Force on stability's role in national security".
President Reagan read the space advice that Niven, Pournelle, and their colleagues prepared, which influenced Reagan's 1983 Strategic Defense Initiative.  "Niven and Pournelle saw an opportunity to shape the great void in their political image, and Reagan viewed space as yet another tool to defend America against the communist superpower...". Science fiction authors such as Arthur C. Clarke and Isaac Asimov criticized the Strategic Defense Initiative. 
After the 9/11 terrorism attacks, a group of sci-fi authors called Sigma, including Pournelle and Niven, advised the "Department of Homeland Security on technological strategies for defeating terrorist threats." 
In 2021, Worldcrunch reported that the French military has hired fiction writers to develop futuristic warfare scenarios, including situations that the military cannot directly study for "ethical reasons, such as Autonomous Lethality Weapon Systems (ALWS), or augmented humans."  The French military says the authors are asked to imagine warfare situations that "destabilize us, scare us, blame, or even beat us", in order to provide the army with a "fresh set of practice scenarios".  Military planners use the science fiction authors' scenarios to "prepare for previously unthought of situations", "boos[t] creativity" and help the military become "more resourceful." 
The German military is also using science fiction to help its military but in its approach, they do not hire science fiction writers to develop scenarios. Instead, they "use existing science fiction" to help the army "predict the "world's next potential conflict." 
The UK Ministry of Defence (MOD) hired two science fiction writers to pen short stories about "what the wars of tomorrow will look like."  The MOD hired Peter Warren Singer and August Cole to write eight short stories about threats from "emerging technologies" including "artificial intelligence (AI), data modeling, drone swarms, quantum computing and human enhancement" in a battlefield context.  The MOD hired sci-fi writers because they have a "unique ability to imagine the unimaginable." As well, both authors know about "security subjects and modern warfare."  They advocate the use of "Fictional Intelligence" ("FicInt"), which they define as "useful fictions". FicInt, a concept developed by Cole in 2015, combines "fiction writing with intelligence to imagine future scenarios in ways grounded in reality." 
Jerry Eugene Pournelle was an American scientist in the area of operations research and human factors research, a science fiction writer, essayist, journalist, and one of the first bloggers. In the 1960s and early 1970s, he worked in the aerospace industry, but eventually focused on his writing career. In an obituary in Gizmodo, he is described as "a tireless ambassador for the future."
Laurence van Cott Niven is an American science fiction writer. His best-known works are Ringworld (1970), which received Hugo, Locus, Ditmar, and Nebula awards, and, with Jerry Pournelle, The Mote in God's Eye (1974) and Lucifer's Hammer (1977). The Science Fiction and Fantasy Writers of America named him the 2015 recipient of the Damon Knight Memorial Grand Master Award. His work is primarily hard science fiction, using big science concepts and theoretical physics. It also often includes elements of detective fiction and adventure stories. His fantasy includes the series The Magic Goes Away, works of rational fantasy dealing with magic as a non-renewable resource.
Joe William Haldeman is an American science fiction author. He is best known for his novel The Forever War (1974). That novel and other works, including The Hemingway Hoax (1991) and Forever Peace (1997), have won science fiction awards, including the Hugo Award and Nebula Award. He was awarded the SFWA Grand Master for career achievements. In 2012 he was inducted as a member of the Science Fiction Hall of Fame. Many of Haldeman's works, including his debut novel War Year and his second novel The Forever War, were inspired by his experiences in the Vietnam War. Wounded in combat, he struggled to adjust to civilian life after returning home. From 1983 to 2014, he was a professor teaching writing at the Massachusetts Institute of Technology (MIT).
The Forever War (1974) is a military science fiction novel by American author Joe Haldeman, telling the contemplative story about human soldiers fighting an interstellar war against an alien civilization known as the Taurans. It won the Nebula Award in 1975 and the Hugo and Locus awards in 1976. Forever Free (1999) and Forever Peace (1997) are respectively, direct and thematic sequel novels. The novella A Separate War (1999) is another sequel of sorts, occurring simultaneously with the final portion of The Forever War. Informally, the novels comprise The Forever War series; the novel also inspired a comic book and a board game. The Forever War is the first title in the SF Masterworks series.
CoDominium is a series of future history novels written by American writer Jerry Pournelle, along with several co-authors, primarily Larry Niven.
Strange and exotic weapons are a recurring feature in science fiction. In some cases, weapons first introduced in science fiction have been made a reality; other science-fiction weapons remain purely fictional, and are often beyond the realms of known physical possibility.
Footfall is a 1985 science fiction novel by American writers Larry Niven and Jerry Pournelle. The book depicts the arrival of members of an alien species called the Fithp that have traveled to the Solar System from Alpha Centauri in a large spacecraft driven by a Bussard ramjet. Their intent is conquest of the planet Earth.
Space warfare is hypothetical combat in which one or more belligerents are situated in outer space. The scope of space warfare therefore includes ground-to-space warfare, such as attacking satellites from the Earth; space-to-space warfare, such as satellites attacking satellites; and space-to-ground warfare, such as satellites attacking Earth-based targets. Space warfare in fiction is thus sub-genre and theme of science fiction, where it is portrayed with a range of realism and plausibility.
First contact is a common science fiction theme about the first meeting between humans and extraterrestrial life, or of any sentient species' first encounter with another one, given they are from different planets or natural satellites. The theme allows writers to explore such topics such as xenophobia, transcendentalism, and basic linguistics by adapting the anthropological topic of first contact to extraterrestrial cultures.
An interstellar war is a hypothetical space war between combatants from different planetary systems. The concept provides a common plot device in science fiction, especially in the space opera subgenre. In contrast, the term intergalactic war refers to war between combatants from different galaxies, and interplanetary war refers to war between combatants from different planets of the same planetary system.
The Man-Kzin Wars is a series of military science fiction anthologies and is the name of the first. The short stories detail the eponymous conflicts between mankind and the Kzinti, set in Larry Niven's Known Space universe. However, Niven himself has written only a small number of the stories; most were written by other science fiction writers, as Niven opened this part of the Known Space to collaboration in the form of a shared universe. The cover art for the books in the series is created by Stephen Hickman.
Space Western is a subgenre of science fiction that uses the themes and tropes of Westerns within science-fiction stories. Subtle influences may include exploration of new, lawless frontiers, while more overt influences may feature literal cowboys in outer space who use rayguns and ride robotic horses. Although initially popular, a strong backlash against perceived hack writing caused the genre to become a subtler influence until the 1980s, when it regained popularity. A further critical reappraisal occurred during the 2000s due to critical acclaim for Firefly.
Mundane science fiction (MSF) is a niche literary movement within science fiction that developed in the early 2000s, with principles codified by the "Mundane Manifesto" in 2004, signed by author Geoff Ryman and "The Clarion West 2004 Class". The movement proposes "mundane science fiction" as its own subgenre of science fiction, typically characterized by its setting on Earth or within the Solar System; a lack of interstellar travel, intergalactic travel or human contact with extraterrestrials; and a believable use of technology and science as it exists at the time the story is written or a plausible extension of existing technology. There is debate over the boundaries of MSF and over which works can be considered canonical. Rudy Rucker has noted MSF's similarities to hard science fiction and Ritch Calvin has pointed out MSF's similarities to cyberpunk. Some commentators have identified science fiction films and television series which embody the MSF ethos of near-future realism.
John Francis Carr is an American science fiction editor and writer as well as the executor of the literary estate of H. Beam Piper.
Science fictional space warfare is main theme and central sub-genre of science fiction that can trace its roots back to classical times, and to the "future war" novels of the 19th century. With the Modern Age, directly with franchises as Star Wars and Star Trek, it's considered one of the most popular general sub-genres and themes of science fiction. An interplanetary, or more often an interstellar or intergalactic war, has become a staple plot device. Space warfare, represented in science fiction, has a predominant role, it's central theme and at the same time it's considered parent, overlapping genre of space opera, military science fiction and Space Western.
The following outline is provided as an overview of and topical guide to science fiction:
Space opera is a subgenre of science fiction that emphasizes space warfare, with use of melodramatic, risk-taking space adventures, relationships, and chivalric romance. Set mainly or entirely in outer space, it features technological and social advancements in faster-than-light travel, futuristic weapons, and sophisticated technology, on a backdrop of galactic empires and interstellar wars with fictional aliens, often in fictional galaxies. The term has no relation to opera music, but is instead a play on the terms "soap opera", a melodramatic television series, and "horse opera", which was coined during the 1930s to indicate a clichéd and formulaic Western film. Space operas emerged in the 1930s and continue to be produced in literature, film, comics, television, video games and board games.
This is a complete bibliography by American science fiction author Larry Niven:
Space travel, or space flight is a classic science-fiction theme that has captivated the public and is almost archetypal for science fiction. Space travel, interplanetary or interstellar, is usually performed in space ships, and spacecraft propulsion in various works ranges from the scientifically plausible to the totally fictitious.