Recently re-read this book. It's considered a classic of military science fiction for good reason. The effects of "future shock" from time dilation on both military strategy and tactics, and the individual soldier, is brilliantly portrayed by the main "A plot" of the story.

Spoiler Alert

The reason I haven't rated this higher is the sociological "B plot" dealing with homosexuality. This "B plot" portrays human society becoming completely homosexual as a result of government programs to control population.

On my first read through the book this bothered me, but I wrote it off as just some element of minor homophobia on my own part being bothered by the idea of a completely homosexual society. Much like the protagonist is obviously bothered by it despite his protestations of tolerance.

On my second read I realized that wasn't what really bothered me. What really bothered me was that for the described society to develop as it does so in the book, homosexuality would have to be a lifestyle choice, and not the result of genetics.

I suppose this was still a reasonable assumption for a heterosexual to make in the early 70s, but it seems very odd today, and is why I didn't enjoy the story as much as I otherwise might have.