The problem with turning that book into a movie is that it's at least as much Uncle Bob lecturing about the ethics and morality of military power and its uses, as it is an action story about Rico in armor, fighting bugs. The powers behind the movie, however, twisted it, and gave a very different message -- that the military is bad, and evil, and fascist. I could go on at great length about the messages in the movie, but I'm afraid that I'd offend people, and get this thread locked, so let me just say that the movie makers were not true to the book at all.