By Staff Sgt. Valerie Halbert, 31st Fighter Wing Public Affairs / Published May 21, 2021 Senior Airman Neil Farbotnik, 555th Aircraft Maintenance Unit F-16 Fighting Falcon crew chief, inspects an F-16 that flew in Astral Knight 2021 (AK21) at Aviano Air Base, Italy, May 18, 2021. Eight F-16s assigned to the 555th Fighter Squadron are participating in AK21, which is a joint, multinational exercise designed to test integrated air and missile defense capabilities. The participating aircraft include the U.S. Air Force F-15E Strike Eagle, HH-60 Pave Hawk and C-130J Super Hercules aircraft, Italian air force F-35 Lightning II aircraft, Hellenic air force F-16 and Emb-145 Erieye aircraft, and Croatian air force MiG-21 BisD/UMD aircraft. (U.S. Air Force photo by Airman 1st Class Brooke Moeder)