Airmen with the 121st Air Refueling Wing Maintenance Squadron conduct an isochronal inspection on a KC-135 Stratotanker at Rickenbacker Air National Guard Base, Columbus, Ohio, July 18, 2023. Isochronal Inspections are detailed inspections conducted every 18 months to ensure aircraft are adequately maintained and mission ready. (U.S. Air National Guard video by Airman First Class Ivy Thomas) More