Certainly not forgotten by the science fiction community, nevertheless not often read any more.
This one is considered a classic by the science fiction reading community, though those who have only seen the film, which frankly is not very good, may disagree. I decided to reread it after reading Jo Walton’s Brief History of the Hugo Awards. It’s one of several older SF novels I’m revisiting.
This novel follows a future world paratrooper from his entry into bootcamp though his first battles and onward as Earth fights alien races for dominance in space.
If this was published today, I doubt this would be as popular as it was in the Sixties, but at the time it was highly thought of and won a Hugo award. I enjoyed reading it again. Worth the time.