U.S. Air Force Airman 1st Class Andrew Roberts, aircraft inspection apprentice assigned to the 18th Equipment Maintenance Squadron, unscrews bolts from a wheel cap of KC-135 Stratotanker during an isochronal inspection at Kadena Air Base, Japan, May 22, 2019. The inspection consists of dividing the plane into five sections, allowing Airmen to examine each section individually. Kadena's KC-135 Stratotankers must be inspected semi-annually by maintenance personnel. (U.S. Air Force photo by Naoto Anazawa)