 Of all American wars , the Korean conflict is believed to have been the deadliest for civilians as a proportion of those killed , including North and South Korean non @-@ combatants killed in extensive U.S. Air Force bombing of North Korea , and South Korean civilians summarily executed by the invading North Korean military . The commission also recommended that the Seoul government negotiate with the United States for reparations for large @-@ scale civilian killings by the U.S. military . This did not occur . Assistant U.S. Secretary of State Stanley Roth was quoted as saying in Seoul at the outset of the No Gun Ri investigation in 1999 that the United States would consider investigating any similar Korean War killings that came to light . The 1999 – 2001 investigation was the last conducted by the United States . 
