Capt. Dan Fenwick, a KC-135 Stratotanker pilot from MacDill Air Force Base, brushes the outside of an engine during pre-flight checks at Nellis Air Force Base, Nevada July 18, 2015 during exercise Red Flag. Red Flag 16-3 is one of four Red Flag exercises at Nellis--this edition of Red Flag focusing on multi-domain operations in air, space and cyberspace. (U.S. Air Force photo/Tech. Sgt. David Salanitri)
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