Armor by John Steakley if you haven't already. It's kind of the other side of Starship Troopers by Heinlein. One of the best books I've ever read.
I tried Gormenghast when I was youngers and gave up early but a decade later I read through all but the last book (got halfway and gave up. Dude was too raddled with drugs by then to be coherent.)
For military SF in general and Eric Flint in particular you can always go to
http://www.baen.com/library/defaultTitles.htm which is the Baen (the actual publisher - this is legit) Free Library where they give away free ebooks so you can get a feel and hopefully buy more real books. Includes Eric Flint's 1632 and 1633 which is about a whole town and a big chunk of Minnesota (IIRC) which gets transported to Europe during the Thirty Years War. Loved it. Only really practical if you've got a PDA or similar ebook reader I spose.