Fun, fast-paced little Scalzi novel. I loved the idea that old folks are being sent out into space once they feel like their lives on Earth are over/they're ready for a "fresh start," as it were. Lo and behold, things aren't quite what they expected once they arrive in space to serve in the CDF (Colonial Defense Forces). I'll be intrigued to continue reading this series, and read this one in about two sittings. 

Fast-paced, not overly developed characters, but there's plenty there.