Staff Sgt. Justin Halford, 28th Maintenance Squadron electro-environmental technician, fills a carbon dioxide life raft bottle during routine maintenance in the electro-environmental shop on Ellsworth Air Force Base, S.D., Sept. 24, 2012. Electro-environmental technicians provide all electrical and environmental parts of the base’s B-1 fleet, such as oxygen tanks, carbon dioxide tanks, and B-1 batteries, ensuring they’re ready to respond at anytime around the globe. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)