 In their report , South Korean investigators acknowledged that no documents showed specific orders at No Gun Ri to shoot refugees . But they pointed to gaps in the U.S.-supplied documents dealing with 7th Cavalry and U.S. Air Force operations . Missing documents included the 7th Cavalry 's journal , or communications log , for July 1950 , the record that would have carried No Gun Ri orders . It was missing without explanation from its place at the National Archives . 
