Dakota Aaron, right, an eSTARR hardware engineer, and Calvin Davis, an instrumentation, data and controls engineer, check the new network switch and data source computers in the Arnold Engineering Development Complex Engine Test Facility T-3 test cell data conditioning room at Arnold Air Force Base, Dec. 3. The network switch and data source computers are part of upgrades to the test cell, including the new digital voltage scanners at the right. (U.S. Air Force photo by Jill Pickett)