U.S. Army paratroopers with 1st Squadron, 91st Cavalry Regiment, 173rd Airborne Brigade, fire their M4 carbine rifles Jan. 28, 2015 during a weapons qualification at the Infantry Training Area in Hammelburg, Germany. Paratroopers from the brigade combined with allied troops from the German Armed Forces United Nations Training Centre for a two-day exercise. (U.S. Army photo by Visual Information Specialist Markus Rauchenberger/released)