Brig. Gen. Jeffrey Pennington and Chief Master Sgt. Cynthia Villa, Fourth Air Force commander and command chief, speak with Reserve Citizen Airmen assigned to the 512th Maintenance Squadron inside the C-5M Super Galaxy Isochronal Maintenance Dock Oct. 17, 2020, at Dover Air Force Base, Delaware. During an ISO inspection, aircraft maintainers strip down the C-5 looking for any deficiencies, faults, cracks or any other problem in every system and of the aircraft. (U.S. Air Force photo by Tech. Sgt. Zachary Cacicia)