A U.S. Air Force pilot from the 555th Fighter Squadron points out procedures during NATO’s enhanced Air Policing Allied mission at Graf Ignatievo Air Base, Bulgaria, Sept. 28, 2020. One of NATO’s roles is to preserve the integrity of allied airspace. Enhanced Air Policing is part of the alliance’s assurance measures for eastern allies. (U.S. Air Force photo by Airman 1st Class Ericka A. Woolever)