Fourth and fifth-generation aircraft from eight countries participate in a partnership flight to kick off Blue Flag 21 over Uvda Air Base, Israel, Oct. 17, 2021. This biennial training event is essential to building and maintaining defensive interoperability, ensuring Israel and other nations maintain a qualitative edge. Large-force exercises, like Blue Flag, allow partner nations to build trust and develop a shared understanding of the security environment. (Israeli Air Force courtesy photo)