The Forever War is a military science fiction novel written by Joe Haldeman. The story follows William Mandella, a soldier who is drafted into an interstellar war against an alien species known as the Taurans. Due to the effects of time dilation during space travel, Mandella experiences decades passing on Earth while only aging a few years. The Forever War is a poignant exploration of the human cost of war and the alienation that comes with being a soldier out of sync with society.