The Forever War series is a series of science fiction novels by Joe Haldeman.
Not all of them take place in the same future universe.
The Forever War and Forever Peace both received the Hugo[1][2] and Nebula[2][3] Awards for Best Novel.
Sections of The Forever War were originally published in Analog Magazine as four novellas: "Hero", "We Are Very Happy Here", "This Best of All Possible Worlds", and "End Game".
"You Can Never Go Back" was published in Amazing Stories and eventually became part of the paperback version of the novel.