Editing Office of Naval Intelligence (section)

===World War II===
Following Japan's [[attack on Pearl Harbor]] in 1941, concerns about subversive activity by Japanese Americans grew more pressing. ONI commissioned Kenneth Ringle, assistant district intelligence officer for the [[Eleventh Naval District]] in Los Angeles, to conduct a thorough investigation of the resident Japanese population. He found little evidence of Japanese American saboteurs, and in his final report to President [[Franklin D. Roosevelt|Roosevelt]], advised against [[Internment of Japanese Americans|mass incarceration]], a view that was shared by most ONI officials, but that was largely ignored by the Army and [[United States Department of War|War Department]].<ref>{{cite web|last=Niiya |first=Brian |url=http://encyclopedia.densho.org/Kenneth_Ringle/ |title=Kenneth Ringle |publisher=Densho Encyclopedia |access-date=2014-09-22}}</ref>

The [[Second World War]] would see another expansion of ONI's duties and a subsequent increase in its budget and staff. The office established two intelligence schools that trained hundreds of Intel officers for the Navy. Its Special Activities Branch offered critical intelligence on German [[U-boat]] technology, operations, and tactics, which proved decisive in the [[Battle of the Atlantic]]. ONI supplied U.S. forces with ship and aircraft recognition manuals, provided photographic specialists for identifying enemy vessels, assisted in naval mission planning, and was responsible for the [[translation]], evaluation, and dissemination of intercepted Japanese communications.<ref name=Niiya-ONI/>