Geisterbrigaden by John Scalzi

A cadre of genetically engineered soldiers created from the DNA of people who never enlisted are thrust into a desperate hunt after the theft and misuse of a brilliant researcher’s work; one newly formed recruit, whose genes and nascent psyche are unnervingly tied to the case, must reconcile implanted memories with emerging selfhood as the unit races across hostile space to stop a catastrophic weapon and confront the ethical limits of identity, loyalty, and the costs of making people for war.

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