U.S. Air Force Staff Sgt. Dakota Williamson, a 6th Maintenance Squadron (MXS) fuels system craftsman, affixes a metal plate to seal a fuel cell bladder at MacDill Air Force Base, Fla., Nov. 25, 2019. By sealing and inflating the fuel cell bladder, the 6th MXS “Tank Divers” uncover leaks or cracks using either a chemical or bubble solution. (U.S. Air Force photo by Airman 1st Class Ryan C. Grossklag)