First flight during Thracian Viper 20
A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, taxis on the runway during exercise Thracian Viper 20 at Graf Ignatievo Air Base, Bulgaria, Sept. 21, 2020. Thracian Viper 20 is a multilateral training exercise with the Bulgarian air force, aimed to increase operational capacity, capability and interoperability with Bulgaria. The multilateral training exercise allowed both U.S. Air Force Airmen and Bulgarian forces to extend joint warfighting capability through operational and tactical training. (U.S. Air Force photo by Airman 1st Class Ericka A. Woolever)