Staff Sgt. Cody Simpson, 28th Civil Engineer Squadron fire suppression driver and operator, teaches a class on self contained breathing apparatus maintenance to Airmen in the 28th CES Fire Safety classroom at Ellsworth Air Force Base, S.D., March 1, 2012. Students are taught how to disassemble, reassemble, functional check and maintain their breathing equipment. (U.S. Air Force photo by Airman Alystria Maurer/Released)