Four U.S. Air Force Thunderbirds Air Demonstration Squadron aircraft fly in a close-air formation during Aviation Nation on Nellis Air Force Base, Nev., Nov. 11, 2016. The Thunderbirds are a demonstration team who display the pride, precision and professionalism of American Airmen. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)
{}