Staff Sgt. Quintin Robinson, 374th Civil Engineer Squadron electrical shop exterior NCO in charge, turns off a substation circuit breaker before repairing a high-voltage transformer in the West Substation at Yokota Air Base, Japan, April 8, 2017. In order to repair a high-voltage transformer, power needed to be down for about 19 hours and it affected certain parts of the main and west side of the base. (U.S. Air Force photo by Machiko Arita)