The Clone Republic — Steven L. Kent

Earth, 2508 A.D. Humans have spread across the six arms of the Milky Way Galaxy. The Unified Authority controls Earth's colonies with an iron fist and a powerful military--a military made up almost entirely of clones...

Private First-class Wayson Harris was raised in a U.A. orphanage among thousands of clones born and bred to be the ultimate soldiers. But Harris isn't like the other Marines: He has a mind of his own: He figures he's paying for that independent streak when his first assignment out of boot camp is the smallest Marine outpost in the whole U.A.

When a rogue general surfaces, the remote desert world Harris thought was a dead-end posting becomes anything but. Fighting off the general's raid gains Harris a promotion. But it also brings him to the attention of some unfriendly U.A. leaders. They have their own plans for the military--plans Harris disrupts by his very existence. For in an army of clones, the one unforgivable sin is to be different...