John Greim, 436th Maintenance Squadron Isochronal Inspection Dock controller, explains the C-5M isochronal inspection process to Rep. Lisa Blunt Rochester of Delaware and Rep. Anthony Brown of Maryland Feb. 14, 2020, on Dover Air Force Base, Delaware. Greim briefed the representatives atop a C-5M Super Galaxy that was on its 40th day of a major isochronal inspection. (U.S. Air Force photo by Roland Balik)