Staff Sgt. Mark Cox, a 455th Expeditionary Civil Engineer Squadron electrical systems craftsman, observes as a boom lift rises at Bagram Airfield, Afghanistan, May 12, 2017. Electrical systems Airmen are responsible for installing, repairing and maintaining electrical networks, ensuring that the primary source of energy for an installation is always available. (U.S. Air Force photo by Staff Sgt. Benjamin Gonsier)