Next Boost for Delta IV Could Come in May

The U.S. Air Force could clear the Delta IV rocket for flight as soon as May as an investigation into a mishap with the Pratt & Whitney Rocketdyne RL10B-2 upper stage winds down. Next up for a Delta IV launch is Boeing's fifth Wideband Global Satcom satellite. Slated for liftoff in January, WGS-5...

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