In Korea, Lt. López served as a platoon commander in A Company, 1st Battalion, 5th Marines, 1st Marine Division (Reinforced). On September 15, 1950, he took part in the amphibious invasion of Inchon. After landing on the beach, he was captured in an iconic photograph by Marguerite Higgins as he led his men over a seawall. Moments later, while preparing to throw a hand grenade into a North Korean bunker, he was struck by automatic weapons fire in the chest and right shoulder, causing him to drop the activated device. Although seriously wounded, Lt. López crawled toward the grenade and unable to throw it because of his injuries, pulled it under his body to shield others from the blast. He was killed in the resulting explosion and was posthumously awarded the Medal of Honor. Secretary of the Navy Dan A. Kimball presented the medal to Lopez's parents during a ceremony in Washington, D.C., on August 30, 1951.