Update August 29th, 8:15AM ET: At just 3 seconds to liftoff, the Delta IV Heavy aborted the launch, just after the engines initially ignited and then shut off quickly. ULA says “an unexpected condition” prompted the abort. ULA’s CEO, Tory Bruno, noted the vehicle is in good shape, but the company will take at least a week to review all the data and try again.

Original Story: In the very early morning hours on Saturday, the United Launch Alliance is set to launch its most powerful rocket from Cape Canaveral, Florida, lofting a classified spy satellite for the National Reconnaissance Office. The mission could be the first of three back-to-back launches out of the Cape, too, with SpaceX set to launch two missions shortly afterward.

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