Dec. 14, 2021 Showcasing the ready, resilient and resourceful Airmen of DM U.S. Air Force Maj. Gen. Michael G. Koscheski, Fifteenth Air Force commander, and Chief Master Sgt. Sonia T. Lee, Fifteenth Air Force command chief, visited Airmen at Davis-Monthan Air Force Base, Arizona, Dec. 6, 2021.