U.S. paratroopers, assigned to 2nd Battalion, 503rd Infantry Regiment, 173rd Infantry Brigade Combat Team (Airborne), prepare to breach a building using explosives during a live-fire exercise, a part of exercise Rock Proof in Postonja, Slovenia, April 30, 2014. Exercise Rock Proof is a two-week long bilateral training exercise between the 173rd IBCT (Airborne) and Slovenian soldiers assigned to the 10th Battalion. (Photo by U.S. Army Spc. Franklin R. Moore / released)