The Forever War, written by Joe Haldeman, is a military science fiction novel that tells the story of William Mandella, a soldier who is sent to fight in an interstellar war against an alien race known as the Taurans. Due to the time dilation effects of space travel, Mandella experiences time passing differently, leading to a disconnect between him and the society he left behind. The book explores themes of war, the dehumanizing effects of combat, and the struggle to find meaning in a constantly changing world.
