A United Launch Alliance Atlas V launched the U.S. Air Force’s fifth Advanced Extremely High Frequency (AEHF) satellite early Aug. 8 after several delays. The Atlas V 551 took off from Space Launch Complex-41 at Cape Canaveral and delivered it toward a high-perigee, low-inclination geosynchronous transfer orbit.  The 551 is the largest of the Atlas V configurations, at 197 ft. (60 m). The rocket’s main engine, the Russian RD-180, is fueled by liquid oxygen/liquid kerosene. ...

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