U.S. Air Force Staff Sgt. Austin Dixon, F-16 Viper Demonstration Team (VDT) dedicated crew chief, left, and Staff Sgt. Ryan Davis, F-16 VDT aerospace propulsion craftsman, stand beside Capt. Zoe “SiS” Kotnik, F-16 VDT commander and pilot, as she taxis her F-16CM Fighting Falcon on the flight line at Joint Base Langley-Eustice, Va., Jan. 28, 2019. Kotnik performed a practice demonstration prior to an Air Combat Command certification flight to become familiar with the airfield. (U.S. Air Force photo by Senior Airman Kathryn R.C. Reaves)