Staff Sgt. Patrick Smith, 8th Civil Engineer Squadron electrical systems technician, powers down a high voltage switch at Kunsan Air Base, Republic of Korea, Nov. 4, 2021. The 8th CES electrical power production unit and 8th Logistics Readiness Squadron fuels flight test their ability to provide power to the base with BPUs, which run on fuel. (U.S. Air Force photo by Staff Sgt. Jesenia Landaverde)