Scalzi, John -- Old Man's War

I read this on Scalzi's web site Way Back When. Old guy signs up on a one-way trip to Explore the Off-World Colonies! Up side: restored youth; down side: it's a military ticket. Most of Earth's old folks go for the deal. We thus get a war story which isn't the growing-up of a naive teenager, which is worth the price by itself. Enthusiatically told and funny, too. The plot of the last section goes off in a somewhat unrelated direction; you could look at this as a set of closely-linked novellas, or as the beginning of a trilogy with long-term plot threads.

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