Quick update. I just picked up Armor from John Steakley. And this book is really intense, as in really really intense! Armor is a brilliant re-imagining of Heinlein's "Starship Troopers". And while I am not into military sci-fi it offers something different:
Armor is a military science fiction novel by John Steakley. It has some superficial similarities with Robert A. Heinlein's Starship Troopers (such as the military use of exoskeletons and insect-like alien enemies) but concentrates more on the psychological effects of violence on human beings rather than on the political aspect of the military, which was the focus of Heinlein's novel.
It was first published in December 1984.