U.S. and Italian Air Forces aircraft consisting of F-35 Lightning IIs, F-16 Fighting Falcons, and a B-52 Stratofortress, fly in formation over the Adriatic Sea during Astral Knight 19, June 4, 2019. Astral Knight is an exercise taking place throughout various locations in Europe, involving over 900 Airmen and supports the collective defense and security of NATO allies and U.S. forces in Europe. More