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Schriever Airmen transition to new GPS control system

Tech. Sgt. Dana Ammend uploads navigation and timing data Sept. 13 to Global Positioning System satellites using the Architecture Evolution Plan ground control system at Schriever Air Force Base, Colo. The AEP, the first upgrade to the GPS ground control segment in more than 20 years, was declared operational Sept. 14. Sergeant Ammend is a space systems operator with the 19th Space Operations Squadron. (U.S. Air Force photo/Staff Sgt. Don Branum)

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