There are so many great Haldeman books, particularly the ones where he sets out to kill a Heinlein book as did "The Forever War" (Starship Troopers) and "Worlds" (The Moon is a Harsh Mistress.)
That book popped into my mind; it took two tries to find it with Copilot and I was pleasantly reminded of who the author was.
There was a followup comic book series, which was decent.