Senior Airman Joseph Clark, 52nd Aircraft Maintenance Squadron crew chief, and a pilot from the 480th Fighter Squadron, conduct a pre-flight inspection at Krzesiny Air Base, Poland, Sept. 11, 2017, in support of Aviation Rotation 17-4. The exercise focused on maintaining joint readiness while building interoperability capabilities and helps strengthen relationships and engagements with allies. (U.S. Air Force photo by Staff Sgt. Jonathan Snyder)