Everyone who told me I'd love this book - you were right. I may, in fact, have done a Success Kid fist-clench with the commensurate, "Yes!" when I found it in our freshly-reloaded office library.
It may not be my favorite book of 2012 (that's "Ready Player One" by a mile), but it's exactly the kind of smart, breezy, Space Marines-flavored stuff that provides a perfectly-weighted escape I enjoy most.
Heinlein's green-tinted shadow is omnipresent, but Bob's problematic sexual politics and expressions are kung-fu gripped into something a lot easier to work with, and don't get in the way of the WE ARE GOING TO BLOW SOME SHIT UP NOW AND FEEL COMPLICATED THINGS ABOUT IT AFTERWARD rambunctiousness.
Now, I need to re-read the sequel, "The Ghost Brigades," because now I know what the fuck the backstory is.