Senior Airman Alan Rosales, 28th Civil Engineer Squadron electrician journeyman, initiates the walk-test feature on the fire alarm system at the Jefferson dormitory during an annual inspection on Ellsworth Air Force Base, S.D., March 13, 2012. This feature saves time and manpower by allowing electricians to test the accuracy of each fire alarm pull station throughout the dormitory in one centralized location. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)