ELLSWORTH AIR FORCE BASE, S.D. -- Senior Airman Coty Winn, 28th Maintenance Squadron aircraft electrical and environmental specialist, uses the panel test set to test the continuity of switches on a landing gear control panel, Sept. 9. The panel test set allows Airmen to test several wires at once rather than checking them one at a time. (U.S. Air Force photo/Airman 1st Class Joshua J. Seybert)