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A powerful Delta IV Heavy rocket is being prepped today for the planned launch Thursday evening of a classified payload for the super-secret National Reconnaissance Office, the federal agency that owns and operates the nation's fleet of spy satellites.
The huge United Launch Alliance rocket -- which is the largest liquid-fueled vehicle since the Apollo Saturn V moon rocket -- is slated to blast off from Launch Complex 37 at 6:10 p.m. The end of the launch window is classified.