Paratroopers from Company B, 2nd Battalion, 503rd Infantry Regiment, 173rd Airborne Brigade prepare to enter a building during rehearsals for a live-fire exercise as part of Exercise Rock Proof III at Pocek Range in Postonja, Slovenia, Dec. 2, 2014. Rock Proof is a series of exercises between 2nd Battalion and the Slovenian 1st Army Brigade, focused on small-unit tactics and building interoperability between allied forces. (U.S. Army Photos by Visual Information Specialist Davide Dalla Massara/Released)