WASHINGTON — The U.S. Air Force will delay a planned bulk order of Atlas 5 and Delta 4 rockets from United Launch Alliance (ULA) at least a year, according to a new report from the Government Accountability Office (GAO).

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Dan Leone is the NASA reporter for SpaceNews, where he also covers other civilian-run U.S. government space programs and a growing number of entrepreneurial space companies. He joined SpaceNews in 2011.Dan earned a bachelor's degree in public communications...