For conspicuous gallantry and intrepidity at the risk of his life above and beyond the call of duty while serving as an automatic rifleman with Company F, 2nd Battalion, 9th Marines, Regimental Combat Team One, 1st Marine Division (Forward), 1st Marine Expeditionary Force (Forward), in Helmand Province, Afghanistan in support of Operation Enduring Freedom on 21 November, 2010.
Lance Corporal Carpenter was a member of a platoon-sized coalition force comprised of two reinforced Marine rifle squads, partnered with an Afghan National Army squad. The platoon had established Patrol Base Dakota two days earlier in a small village in the Marja District in order to disrupt enemy activity and provide security for the local Afghan population.
Lance Corporal Carpenter and a fellow Marine were manning a rooftop security position on the perimeter of Patrol Base Dakota when the enemy initiated a daylight attack with hand grenades, one of which landed inside their sandbagged position. Without hesitation and with complete disregard for his own safety, Lance Corporal Carpenter moved towards the grenade in an attempt to shield his fellow Marine from the deadly blast. When the grenade detonated, his body absorbed the brunt of the blast, severely wounding him but saving the life of his fellow Marine.
By his undaunted courage, bold fighting spirit, and unwavering devotion to duty in the face of almost certain death, Lance Corporal Carpenter reflected great credit upon himself and upheld the highest traditions of the Marine Corps and the United States Naval Service.