The Forever War
Joe Haldeman
 William Mandella is a physics student conscripted for an elite task force in the United Nations Exploratory Force being assembled for a war against the Taurans, an alien species discovered when they apparently suddenly attacked human colonists' ships. The UNEF ground troops are sent out for reconnaissance and revenge. The elite recruits have IQs of 150 and above, are highly educated, healthy and fit. Training is gruellingfirst on Earth, in Missouri, and later on Charon (not Pluto's moon, which had not yet been discovered at the time of the novel's writing, but a hypothetical planet beyond Pluto's orbit), which results in a number of casualtiesmainly due to accidents in hostile environments but also due to the use of live weapons in training. The new soldiers then depart for action, traveling via wormhole-like phenomena called 'collapsars' (called Black Holes today) that allow ships to cover thousands of light-years in a split second. However, traveling to and from the collapsars at near-lightspeed has massive relativistic effects. Their first encounter with (unarmed) Taurans on a planet orbiting Epsilon Aurigae turns into a massacre, with the unresisting enemy base wiped out. Mandella melancholically reflects on how typical the encounter was for humanity's previous record in interaction with other cultures. This first expedition, beginning in 1997, lasted only two years from the soldier's perspective, but due to time dilation, upon return to Earth decades have passed. On the long way home, the soldiers experience future shock first-hand, as the Taurans employ increasingly advanced weaponry against them while they do not have the chance to re-arm. Mandella, with soldier, lover and companion Marygay Potter, returns to civilian life, only to find humanity drastically changed. He and his fellow soldiers have difficulty fitting into a future society that has evolved almost beyond their comprehension. The veterans learn that to curb overpopulation, which led to worldwide class wars caused by inequitable rationing, homosexuality has become officially encouraged by many of the world's nations. The world has become a very dangerous place due to widespread unemployment and the easy availability of deadly weapons. The changes within society alienate Mandella and the other veterans to the point where many re-enlist to escape, even though they realize the military is a soulless construct. Mandella attempts to get an assignment as an instructor on Luna but is promptly reassigned by standing order to combat command. The inability of the military to treat its soldiers as more than highly complex valuable machines is a theme of the story. Almost entirely through luck, Mandella survives four subjectively experienced years of military service, which time dilation makes equivalent to several centuries. He soon becomes the objectively oldest surviving soldier in the war, attaining high rank through seniority, not ambition (he is essentially a pacifist and an eternally reluctant soldier, who acts mostly from talent and a melancholic sense of duty). Despite this he is separated from Marygay (who has remained his last contact with the Earth of his youth) by UNEF's plans, despite the fact that many of the people who he would command had not yet been born. As the commanding officer of a 'strike force', Mandella commands soldiers who speak a language largely unrecognizable to him, whose ethnicity is now nearly uniform and are exclusively homosexual. He is disliked by the soldiers because they have to learn 21st century English to communicate with him and other senior staff, and because he is heterosexual. Engaging in combat thousands of light years away from Earth, Mandella and his soldiers need to resort to medieval weapons in order to fight inside a "stasis field" which neutralizes all electromagnetic radiation in anything not covered with a protective coating. They battle to survive what is to be the last conflict of the war. During the time that has since passed on Earth, humankind has begun to employ human cloning, resulting in a new, collective species calling itself Man. Man has developed a means of communication unique and inherent to clones, which allows them to communicate with the Taurans, leading to peace. When Man finally gains the ability to communicate with the Taurans, it is discovered that the Taurans were not responsible for the millennium-old destruction of the colonial vessels in question. The futile, meaningless war that lasted for more than a thousand years ends. Man establishes several colonies of old-style, heterosexual humans, just in case the evolutionary change proves to be a mistake. Mandella travels to one of these colonies, named 'Middle Finger' in the definitive novel adaption. There he is reunited with Marygay, who had been discharged much earlier and had intentionally used time dilation to age at a much slower rate, hoping and waiting for Mandella's return. The epilogue is a news item from the year 3143 AD announcing the birth of a "fine baby boy" to Marygay Potter-Mandella.