Yesterday I finished Old Man's War by John Scalzi, his first novel.

Old Man's War is a deliberate throwback that draws obvious comparisons to books like Heinlein's Starship Troopers and Haldeman's Forever War. The main difference is that the soldiers in those books are externally enhanced (power armor, weapons) while the ones in Old Man's War are internally enhanced (modified clone bodies with enhancements).

It's a good back, well written with appealing characters, but thinking back to the other two novels I mentioned, I'm not sure what it adds to this genre. It's variations on the themes are slight and it's point of view seems not dissimilar. But based on this book, I will probably read others from Scalzi.