Senior Airman Joseph Clark, 52nd Aircraft Maintenance Squadron assistant dedicated crew chief, talks with the pilot during pre-flight check at Krzesiny Air Base, Poland, Sept. 11, 2017. Aviation Rotation 17-4 focuses on maintaining joint readiness while building interoperability capabilities. Through strengthened relationships and engagements with our Allies, the United States and NATO demonstrate their shared commitment to a peaceful, stable and secure Europe. (U.S. Air Force photo by Staff Sgt. Jonathan Snyder)