The Forever War by Joe Haldeman
My rating: 4 of 5 stars
Some pretty darn good sci-fi. Haldeman illuminates the cultural and social dislocation experienced by soldiers returning home using the time dilation effects of high velocity space travel. There is also a middle section set in the distant future of 2007 (this novel was published in 1974). It’s a bit weaker than the rest of the book, but at least provides the unintentional comedy that seems to be the fate of most science fiction once the present has passed it by.