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An F-16 Fighting Falcon assigned to the 40th Flight Test Squadron at Eglin Air Force Base, Fla., receives fuel from a KC-10 Extender assigned to Joint Base McGuire-Dix-Lakehurst, N.J., during flutter testing, Aug. 23, 2019. Flutter testing evaluates the vibration characteristics of the airplane at certain speeds to assess the impact on the plane and identify potential structural weaknesses. (U.S. Air Force photo by Tech. Sgt. John Raven)
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EF24-70mm f/2.8L II USM
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