The Forever War, by Joe HaldemanRead about the other entries on the list.
Again, The Forever War is basically a Twilight Zone episode extended into a novel. It's the gritty, heart-wrenching story of an intergalactic war started on shaky grounds and drawn out over millennia. A harrowing read at times, but one you'll be glad you started.
The Forever War made Emily Stamm and Charlie Jane Anders's list of the ten best science fiction stories where humans are the villains and Charlie Jane Anders's list of the 12 greatest science fiction war stories.
--Marshal Zeringue