U.S. Army paratroopers assigned to the 173rd Airborne Brigade Special Troops Battalion rehearse parachute landing falls while at Aviano Air Base, Italy, for airborne operations onto Juliet and Frida Drop Zones in Pordenone, April 13, 2015. The 173rd Airborne Brigade is the Army Contingency Response Force in Europe, capable of projecting ready forces anywhere in the U.S. European, Africa or Central Commands areas of responsibility within 18 hours. (U.S. Army photo by Visual Information Specialist Paolo Bovo/Released)