The National Institute of Korean History has made public two U.S. historical documents detailing the Japanese military’s role in supervising frontline prostitution during the Second World War.

The state-run institute says the two documents were unearthed from the U.S. National Archives and Records Administration(NARA).

One of them, dubbed “Bulletin No. 182” of the Allied Forces' Southeast Asia Translator & Interrogation Center, describes tolerance of rape and pillage by Japanese soldiers in China, describing them as "an inseparable part of war.”

A separate report labeled "470" quotes a Japanese prisoner captured in Indonesia as saying that seven brothels were established, in his words, "under Army jurisdiction."