#Boeing #GPS satellites: 560 years of reliable on-orbit operation for @USAirForce and @AFSpace MORE: http://www.boeing.com/resources/boeingdotcom/space/global_positioning_system/pdf/gps_snapshot.pdf … #IONJNCpic.twitter.com/u2afxsTqtR
6:53 AM - 7 Jun 2017
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