U.S. soldiers prepare to fire an M119 howitzer during Exercise Rock Proof V at Pocek Range in Postonja, Slovenia, Oct. 15, 2015. The paratroopers are assigned to the 4th Battalion, 319th Airborne Field Artillery Regiment, 173rd Airborne Brigade Combat Team. 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 Paolo Bovo