Army paratroopers Staff Sgt. Mario Avilesmancia, left, and Sgt. Kevin Burns, assigned to Able and Weapons Company, respectively, 3rd Battalion, 509th Parachute Infantry Regiment, 4th Brigade Combat Team (Airborne), 25th Infantry Division, Army Alaska, exit a grenade pit after throwing live M67 fragmentation grenades at Joint Base Elmendorf-Richardson, Alaska, Dec. 12, 2017. The fragmentation hand grenade has a lethal radius of 5 meters and can produce casualties up to 15 meters, dispersing shrapnel as far as 230 meters. ( Air Force

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