Airman 1st Class Joseph Cockerham, left, 388th Maintenance Squadron Propulsion Flight and Staff Sgt. Christopher Basile, 419th Maintenance Squadron Propulsion Flight, tear down an F-16 compressor unit, Hill Air Force Base, Utah, July 13, 2107. The total force unit produces overhauled F110-GE-100 engines for Hill, Holloman and Nellis Air Force Bases. (U.S. Air Force photo/R. Nial Bradshaw)