Over the next few weeks, the U.S. Air Force plans to use one of two thruster systems still functioning on a protected military communications satellite built by Lockheed Martin to reach an intermediate orbit after failure of a liquid apogee engine on the spacecraft. The Aug. 14 launch of the Atlas V carrying the first Advanced Extremely High Frequency (AEHF) satellite, estimated to cost more than $2 billion, toward geosynchronous orbit was nominal. But the spacecraft’s liquid apogee ...


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