Maintainers from the 919th and 592nd Special Operations Maintenance Squadrons inspect the inner and outer fuel bladders on a cold bulk fuel delivery system at Duke Field, Fla., Sept. 22, 2017. The system, carried aboard a C-146 aircraft, provides a ground refueling capability for other special operations aircraft as needed in austere airfield locations worldwide. (U.S. Air Force photo/Dan Neely)