U.S. paratroopers engage targets with M240 machine guns during live-fire training as part of Rock Proof V at Bac Range in Postojna, Slovenia, Oct. 19, 2015. The exercise aims to build relationships between allies and provide realistic training environments for all parties involved. The paratroopers are assigned to 2nd Battalion, 503rd Infantry Regiment, 173rd Airborne Brigade. U.S. Army photo by Paolo Bovo