U.S. Air Force Staff Sgt. Derrick Renfro, 23d Equipment Maintenance Squadron crew chief, and Senior Airman Andrew Burrell, 23d EMS aerospace propulsion journeyman, install a tailpipe ejector onto an HC-130J Combat King II during an isochronal inspection, Aug. 16, 2016, at Moody Air Force Base, Ga. Aircraft receive a variety of ISO inspections that last anywhere between 3-20 days. (U.S. Air Force photo by Airman 1st Class Daniel Snider/Released)