Tech. Sgt. Matthew Armstrong, 436th Civil Engineer Squadron electrician, gives the thumbs up after checking the voltage of an electrical cable March 18, 2015, at Dover Air Force Base, Del. The electric shop was inspecting the Emergency Airfield Lighting System for damage and wear-and-tear from use and transportation. (U.S. Air Force photo/Airman 1st Class Zachary Cacicia)
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