Lt. Col. Christopher Hammond, U.S. Air Force Air Demonstration Squadron commander, salutes Thunderbird crew chiefs before take-off during the Aviation Nation air show on Nellis Air Force Base, Nev. Nov., 11, 2016. Before joining the team, Hammond was the director of operations at the 16th Weapons Squadron, Nellis AFB, Nev. Hammond has logged more than 2,500 flight hours, with more than 400 hours of combat experience in the F-16. (U.S. Air Force photo by Airman 1st Class Kevin Tanenbaum/Released)