Programmed Depot maintenance modernizes KC-135s
A KC-135 Stratotanker is parked inside a maintenance hangar prior to a test flight at the Oklahoma City Air Logistics Complex on Tinker Air Force Base, Oklahoma Nov. 23, 2019. After going through programmed depot maintenance, each aircraft must be taken on a test flight to ensure it is safe for long-term use. (U.S. Air Force photo by Airman Kiaundra Miller)

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Photo by: Airman 1st Class Kiaundra Miller |  VIRIN: 191123-F-JR816-1128.JPG