WHEN OUR WORLD ENDED, THEIR MISSION BEGANThe Sixty Minute War brought humanity to the brink of annihilation. Billions perished. The planet Earth was turned into a virtual graveyard, with the shattered, burned-out skeletons of great cities serving as tombstones marking Mankind's demise.But in the United States, one final outpost remains. Ten years have passed, and Harmony Base, a subterranean U.S. Army installation that survived the nuclear inferno,...