U.S. Air Force Gen. Mark Kelley, commander of Air Combat Command, attends the change of command ceremony for Fifteenth Air Force at Shaw Air Force Base, S.C., Aug. 13, 2021. Fifteenth Air Force is responsible for ensuring the agile combat support capabilities of 13 wings and three direct reporting units, preparing Airmen for the dynamic requirements of air, space and cyberspace of the future. These units encompass about 600 aircraft and more than 47,000 active duty and civilian members. Fifteenth Air Force is also responsible for the operational readiness of 16 National Guard and Air Force Reserve Units. (U.S. Air Force photo by Tech. Sgt. Megan Floyd)