The go-ahead for launch of the U.S. Air Force’s Orbital Test Vehicle (OTV) is on hold pending the review of an “unexpected data signature” emitted during the Oct. 8 launch of Boeing’s GPS IIF-3 satellite on a Delta IV (4,2) rocket. United Launch Alliance and Pratt & Whitney Rocketdyne are investigating the anomaly, and certification of the OTV launch will not be provided until officials understand the root cause. The signal was emitted when operators observed reduced thrust of the ...

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