The Night of the Trolls by Keith Laumer

The doors of the Primary Site blockhouse were nine-foot-high, eight-inch-thick panels of solid chromalloy that even a Bolo would have slowed down for, but they slid aside for my electropass like a shower curtain at the YW. I went into a shadowy room where eighty years of silence hung like black crepe on a coffin. The tiled floor was still immaculate, the air fresh. Here at the heart of the Aerospace Center, all systems were still go.

In the Central Control bunker, nine rows of green lights glowed on the high panel over red letters that spelled out STAND BY TO FIRE. A foot to the left, the big white lever stood in the unlocked position, six inches from the outstretched fingertips of the mummified corpse strapped into the controller's chair. To the right, a red glow on the monitor panel indicated the locked doors open.