Airman 1st Class Zachary Jacobs, 319th Civil Engineer Squadron electrical power production technician, walks up a spiral staircase after checking the operational status of electrical generators Grand Forks Air Force Base, N.D., Dec. 4, 2013. The 319th CES checks all generators on a routine basis in order to ensure the base has sufficient electrical power to maintain essential operations during severe winter weather. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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