U.S. Air Force Staff Sgt. Eric Yates, 22nd Aircraft Maintenance Squadron crew chief, and Capt. Marcus Watson, 344th Air Refueling Squadron, conduct an exterior pre-flight inspection at McConnell Air Force Base, Kansas, June 30, 2021. Pre-flight inspections require aircrews to perform visual checks of controls and instruments prior to starting engines. (U.S. Air Force photo by Airman 1st Class Zachary Willis)