U.S. Special Forces soldiers clear a stairwell during an assault during exercise Black Swan in Szolnok, Hungary, July 21, 2017. Black Swan was a Hungarian-led special operations forces exercise held across locations in Bulgaria, Hungary and Romania from June 26-July 22, 2017. The exercise included participants from over eight countries. Paratroopers assigned to the U.S. Army’s 173rd Airborne Brigade and 10th Combat Aviation Brigade also participated in the exercise alongside the 20th Special Forces Group to improve integration between special operations forces and conventional forces across NATO allies. Army photo by Staff Sgt. Aaron Duncan