After donning gas masks, U.S. Army paratroopers assigned to Dog Company, 3rd Battalion, 509th Parachute Infantry Regiment, 4th Infantry Brigade Combat Team (Airborne), 25th Infantry Division, U.S. Army Alaska, engage a target with a M2A1 machine gun during mounted night live-fire training at Joint Base Elmendorf-Richardson, Alaska, Nov. 16, 2018