U.S. Air Force Tech Sgt. Ryan Williams, 7th Equipment Maintenance Squadron B-1B isochronal section chief, briefs U.S. Air Force Gen. Hawk Carlisle, commander of Air Combat Command, on B-1B Lancer inspections May 1, 2015, at Dyess Air Force Base, Texas. An isochronal inspection is scheduled routine maintenance, in which the aircraft is taken apart and inspected for damage and structural weaknesses and is then repaired. (U.S. Air Force photo by Airman 1st Class Autumn Velez/Released)