Peace And War: The Omnibus Edition/Forever Peace, Forever Free, Forever War by Joe Haldeman
Together in one volume for the first time ever - the classic novel of epic future conflict THE FOREVER WAR, its sequel FOREVER FREE, and the companion novel FOREVER PEACE
William Mandella is a reluctant hero, fighting in a distant interstellar war against unknowable and unconquerable aliens. But his greatest test will be returning to Earth. A few months of his tour of duty equate to centuries on his homeworld, during which he becomes increasingly isolated from the world he has been fighting to protect.
Mandella returns home for the last time - to find humanity has evolved into a group conciousness which excludes him. Alone, alienated and missing the certainties of combat, he and his fellow verterans search for an escape - and finally look towards space.
A war is raging, fought by indestructible machines operated remotely by soldiers miles away - and for soldiers like Julian Class, war is truly hell. So when he and his companion, Dr Amelia Harding, uncover something which could take the universe back to square one, the prospect isn't so much terrifying, as terrifyingly tempting ...