Air Force Capt. Zoe “SiS” Kotnik, F-16 Viper Demonstration Team (VDT) commander and pilot, smiles after a certification flight at JJoint Base Langley-Eustis, Va., Jan. 29, 2019. Kotnik performed more than 30 practice missions before the certification.

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Keywords: archive, armed, defence, forces, military, reportage, servicemen, usa