ELLSWORTH AIR FORCE BASE, S.D. -- Senior Airman Coty Winn, 28th Maintenance Squadron aircraft electrical and environmental specialist, tests the continuity of switches on a landing gear control panel, Sept. 9. Airmen can test the landing gear continuity manually and through a machine called the panel test set. (U.S. Air Force photo composite/Airman 1st Class Joshua J. Seybert)