U.S. Army 173rd Airborne Brigade Soldiers head into the field to take part in one of the many situational training lanes happening during Immediate Response 15 in Slunj, Croatia, Sept. 14, 2015. Immediate Response 15 is a multinational, brigade-level, Command Post Exercise utilizing computer-assisted simulations and field training exercises in Croatia and Slovenia. The exercises and simulations are designed to enhance regional stability, strengthen partner capacity, and improve interoperability. U.S. Army photo by Sgt. 1st Class Caleb Barrieau