An F-16 from the 40th Flight Test Squadron located at Eglin Air Force Base, FL recieves gas from a KC-10 Extender from McGuire AFB, NJ, during flutter testing on 23 August 2019. Flutter testing evaluates the vibration characteristics of the airplane at certain speeds to asses the impact of plane lifetime and safe mission accomplishment. (U.S. Air Force photo by Tech. Sgt. John Raven)

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Photo by: Tech. Sgt. John Raven |  VIRIN: 190823-F-OC707-0303.JPG