Maintenance Airmen upgrade engine

U.S. Air Force Airman 1st Class Caleb Gulley, 20th Component Maintenance Squadron aerospace propulsion journeyman, left, holds a flashlight as Col. Colin Morris, 20th Maintenance Group commander, removes a bearing retaining nut on an F-16CM Fighting Falcon low pressure turbine at Shaw Air Force Base, S.C., Aug. 29, 2017. The Airmen performed the task as part of the 6K engine service life extension program, in which different parts of an engine are upgraded to extend service life by approximately 20%. (U.S. Air Force photo by Airman 1st Class Kathryn R.C. Reaves)