The Forever War by Joe Haldeman
The classic anti-war military SciFi book seen by many as an answer to Robert Heinlein’s Starship Troopers (the Monday book pick from Feb. 9, 2009). Haldeman claims that isn’t how he wrote it, and Robert Heinlein thought it was a damn good good book. An opinion I share.
Read it years ago. Truly a classic. And Heinlein knew a think or two about SF, I guess. Haldeman’s later stuff, I could take or leave.