Senior Airman Brock Metscher, 28th Communications Squadron network controls technician, enters data into a network server during a controlled power outage at Ellsworth Air Force Base, S.D., Oct. 29, 2012. The intent of the controlled power outage is to reveal which network systems are not supported by either uninterruptable power supplies or a building generator in the event of a power failure. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)