Starcraft II: Heaven's Devils by William C. Dietz
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Summary
For the poor, hardworking citizens of the Confederacy's fringe worlds, the Guild Wars have exacted a huge toll. Swayed by the promise of financial rewards, a new batch of recruits joins the fight alongside a slew of mysteriously docile criminals -- and a few dubious military leaders. Eighteen-year-old Jim Raynor, full of testosterone and eager to make things right at home, ships off to boot camp and finds his footing on the battlefield, but he soon discovers that the official mission is not what he's really fighting for.