U.S. Air Force Thunderbird Air Demonstration Squadron crew chiefs line up during their demonstration at Aviation Nation on Nellis Air Force Base, Nev., Nov. 11, 2016. Since 1953, the Thunderbirds have performed for millions of people across the United States, spreading the word about the Air Force and its precision, skill and decisive combat power. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)