Marching On Croatian soldiers march back to base camp after completing situational training during Immediate Response 15 in Slunj, Croatia, Sept. 15, 2015. Immediate Response 15 is a multinational, brigade-level, Command Post Exercise utilizing computer-assisted simulations and field training exercises in Croatia and Slovenia. U.S. Army photo by Sgt. 1st Class Caleb Barrieau SHARE: Download: Full Size (1.69 MB) Tags: Photo Essays, Slunj, Slovenia, nato, croatia, Soldiers, All images Credit: Sgt. 1st Class Caleb Barrieau VIRIN: 150913-A-WB953-016.JPG Photo Gallery