A Republic of Korea Air Force, F-35A Lightning II approaches a KC-135 to refuel March 15, 2019, in Ariz. The F-35’s engine produces 43,000 pounds of thrust and contains a 6-stage compressor, 3-stage fan, single stage high-pressure turbine, annular combustor and a 2-stage low-pressure turbine. (U.S. Air Force photo by Airman 1st Class Leala Marquez)