Staff Sgt. Keagan Rosario, 421st Aircraft Maintenance Unit BOLT mission systems technician, performs preflight checks on an F-35A Lightning II fighter jet May 31, 2019, at Aviano Air Base. The F-35A is an agile, versatile, high-performance, 9G capable multirole fighter that combines stealth, sensor fusion and unprecedented situational awareness. Airmen from the 388th and 419th Fighter Wings at Hill Air Force Base, Utah, are in Europe as part of a Theater Security Package. Currently they are participating in Astral Knight 2019, a joint and multinational exercise that involves airmen, soldiers and sailors from the United States, and airmen from Croatia, Italy, and Slovenia. The exercise is an integrated air and missile defense exercise focused on defending key terrain. (U.S. Air Force photo by Tech. Sgt. Jim Araos)