U.S. Air Force Maj. Matt Ables, 9th Air Refueling Squadron KC-10 Extender pilot, conducts pre-flight checks on a mask before a training sortie at Travis Air Force Base, California, Nov. 26, 2018. Travis Airmen conduct training events to stay current and be prepared for future mobility operations. (U.S. Air Force Photo by Master Sgt. Joseph Swafford)

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Photo by: Master Sgt. Joseph Swafford |  VIRIN: 181126-F-QN515-0411.JPG