The Dying of the Light

"I didn't see Rebecca die the second time."
The United States military hides a secret: the completely real existence of eat-your-brains, one-bite-and-you're-dead zombies. The Army has known they exist for over a hundred years, and has been quietly and expertly keeping the secret.
Until now.
His hometown destroyed, with everyone he has ever known dead and gone, the sole survivor of the massacre at Fall Creek joins a secret military group to combat the single greatest threat our world has ever faced. Unfortunately, his help may come too late. Even as victories over the walkers mount, the seeds of our ultimate doom are sown from within, and at the last, only a brave few may survive to carry on.