F-16 Fighting Falcons Thunderbirds perform a five-ship formation after refueling from a 92nd Air Refueling Wing KC-135 Stratotanker Sept. 1, 2014, over Glacier National Park, Mont. The Thunderbirds were making their way back to Nellis Air Force Base, Nev., where they are assigned to the 57th Wing’s U.S. Air Force Air Demonstration Squadron. (U.S. Air Force photo/Airman 1st Class Janelle Patiño)