United Launch Alliance has rolled the Atlas V rocket carrying the U.S. Air Force’s second Wideband Global Satcom (WGS-2) spacecraft back from Launch Complex 41 to its integration building at Cape Canaveral, where technicians are attempting to determine the cause of the upper-stage liquid oxygen leak that resulted in the scrubbing of the previous day’s launch attempt. The oxidizer valve leak was discovered during fueling of the Centaur upper stage at about 7:45 p.m. EDT March 17, in ...

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