A Marines with 81mm mortars platoon, Weapons Company, 3rd Battalion, 5th Marine Regiment, provides security during a partol while conducting a counter-improvised-explosive device exercise at Range 215, Nov. 15, 2013. - A Marines with 81mm mortars platoon, Weapons Company, 3rd Battalion, 5th Marine Regiment, provides security during a partol while conducting a counter-improvised-explosive device exercise at Range 215, Nov. 15, 2013.