A U.S. Air Force F-16 Fighting Falcon assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, taxis on the runway during NATO’s enhanced Air Policing allied mission at Graf Ignatievo Air Base, Bulgaria, Sept. 28, 2020. Enhanced Air Policing is part of the Alliance’s assurance measures for eastern allies. The assurance measures have provided continuous military presence and meaningful activity in the eastern part of the Alliance on a rotational basis. (U.S. Air Force photo by Airman 1st Class Ericka A. Woolever)