Airman 1st Class Corey Frey, 28th Communications Squadron client systems technician, unplugs wires inside a computer tower while troubleshooting a central processing unit at Ellsworth Air Force Base, S.D., April 4, 2012. Client systems technicians keep the network and systems operating by quick response and resolution of computer problems on base. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)