U.S. Air Force Senior Airman Adam Armstrong, F-16 Viper Demonstration Team crew chief, signals to a pilot after landing at Joint Base Langley-Eustis, Va., Jan. 31, 2017. Crew chiefs assigned to the team, travel to each destination with their aircraft, ensuring the aircraft is ready for flight at all times. (U.S. Air Force photo by Senior Airman Kimberly Nagle)