A U.S. paratrooper conducts a radio check during a night live-fire exercise as part of Exercise Rock Proof V at Pocek Range in Postojna, Slovenia, Oct. 20, 2015. The paratrooper is assigned to the 2nd Battalion, 503rd Infantry Regiment, 173rd Airborne Brigade. Exercise Rock Proof V is a bilateral training exercise between U.S. soldiers and the Slovenian Armed Forces, focused on small-unit tactics and building interoperability between allied forces. U.S. Army photo by Davide Dalla Massara