A U.S. soldier has been sentenced to seven years in prison for his role in a series of so-called “thrill killings” that left three Afghan civilians dead. Andrew Holmes, 21, confessed to firing a heavy machine gun at a boy from 15 feet away, after his co-defendant threw a grenade at him. He also confessed to carrying the severed bone of his victim and smoking hashish. He is the third member of an alleged rogue army unit to admit his role in killings of Afghan civilians.