A carbon dioxide bottle is filled up during routine maintenance in the 28th Maintenance Squadron electro-environmental shop on Ellsworth Air Force Base, S.D., Sept. 24, 2012. The bottle is filled with a half of a pound of carbon dioxide and is used to fill up a life raft in the event of an aircrew member ejecting from a B-1 over water. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)