Adriatic Allies U.S. and Italian air force aircraft fly in formation over the Adriatic Sea during Exercise Astral Knight 19, June 4, 2019. More than 900 U.S. airmen are participating in Astral Knight to support the collective defense and security of NATO allies and U.S. forces in Europe. SHARE IMAGE: Download Image: Full Size (1.54 MB) Tags: Exercises, training, Partnerships, air force, Astral Knight Photo By: Air Force Staff Sgt. Joshua R. M. Dewberry VIRIN: 190604-F-BG094-0547F.JPG Photo Gallery