U.S. Air Force Staff Sgt. Jared Weeks, 7th Civil Engineer Squadron Fire Prevention craftsman, dons the necessary protective equipment during a group-training exercise at Dyess Air Force Base, Texas, May 22, 2017. Firefighters are required to wear a fire-retardant suit as well as a breathing apparatus which provides oxygen while working in smoke-filled areas. (U.S. Air Force photo by Airman 1st Class Katherine Miller)