An F-16 Fighting Falcon assigned to the 64th Aggressor Squadron takes off for a training flight Aug. 13, 2013, at Nellis Air Force Base, Nev. Aggressor pilots utilize adversary tactics and act as hostile forces during air-combat exercises. (U.S. Air Force photo/Airman 1st Class Joshua Kleinholz)

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Photo by: Airman 1st Class Joshua Kleinholz |  VIRIN: 130813-F-MF020-162.JPG