Senior Airman Clarence Brooks, 6th Maintenance Squadron, and Staff Sgt. Vince Williams, 927th Maintenance Squadron, inspect a fuel bladder from a KC-135 Stratotanker underneath a fuel cell trainer January 28, 2014, at MacDill Air Force Base, Fla. The 6th and 927th MXS use fuel cell trainers, made from parts of a decommissioned KC-135, to help maintainers practice various repairs for the aerial refueling aircraft. (U.S. Air Force photo by Staff Sgt. Jennie Chamberlin)