Maj. Gen. John C. Flournoy, Jr., Commander, Fourth Air Force, passes the guidon to the new 507th Air Refueling Wing commander, Col. Douglas E. Gullion, at the change of command ceremony April 2, 2016, at Tinker Air Force Base, Okla. Gullion is a command pilot who has served nearly 30 years and has flown more than 6,500 flight hours. (U.S. Air Force photo/Tech. Sgt. Lauren Gleason)

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Photo by: Tech. Sgt. Lauren Gleason |  VIRIN: 160402-F-EW270-399.JPG