Senior Airman Daniel Cordova, left, and Airman 1st Class Alex Price, 28th Civil Engineer Squadron electrician journeymen, test the mass notification system during an annual inspection at the Jefferson dormitory on Ellsworth Air Force Base, S.D., March 13, 2012. The system automatically notifies both dormitory residents and the base Fire Department in the event of an emergency. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)