Matterhorn by Karl Marlantes. It's a Vietnam book. It's truly fascinating; you can read it both as a window into the author's mind (he's clearly a manic depressive with some serious, and completely understandable, victimhood issues) or a straight recount of the war, or as a work of fiction. It's also very, very readable, the characters are believable, the prose is pretty and often beautiful. A truly great book.