Black Swan U.S. and Hungarian naval forces transit a body of water during Black Swan in Budapest, Hungary, May 11, 2021. The Hungarian-led exercise is designed to test military synchronization capabilities. SHARE: Download: Full Size (1.4 MB) Tags: exercise, Navy, Black Swan Credit: Courtesy photo by U.S. Embassy Budapest VIRIN: 210512-A-RL000-1007M.JPG Photo Gallery