Tech. Sgt. Rory Riggs, 9th Aircraft Maintenance Unit dedicated crew chief, moves chalks on the flightline as a B-1B Lancer aircraft taxis during a Copper Ring exercise at Dyess Air Force Base, Texas, Sept. 13, 2021. Crew chiefs are tasked with ensuring an aircraft is mission ready by conducting day-to-day maintenance that includes diagnosing malfunctions, replacing components and detailed inspections. (U.S. Air Force photo by Staff Sgt. David Owsianka)