Lance Cpl. Joel Murray was aboard Forward Operating Base Shir Ghazi in Afghanistan on May 13 when a truck laden with explosives detonated outside. Three Georgian soldiers were mortally wounded, and several other Georgians and U.S. Marines sustained injuries. Murray, an engineer equipment operator with Combat Logistics Regiment 2, quickly rushed to the site of the blast, Marine officials said. Insurgents were attempting to penetrate the security perimeter of the base, in Helmand province’s Musa Qala district. Murray killed an enemy fighter, and then applied a tourniquet to a Georgian soldier who had sustained a life-threatening leg injury, according to…