As seen through a night-vision device, U.S. paratroopers prepare for a night live-fire exercise as part of Exercise Rock Proof V at Pocek Range in Postonja, Slovenia, Oct. 18, 2015. The paratroopers are assigned to the 2nd Battalion, 503rd Infantry Regiment, 173rd Airborne Brigade. Rock Proof V is a bilateral training exercise focused on small-unit tactics and building interoperability between U.S. soldiers and the Slovenian armed forces. U.S. Army photo by Davide Dalla Massara