During the 1920s and 1930s, many of ONI's activities were dedicated to Japan, which was an increasingly advanced and belligerent naval power. The office investigated Japanese fortifications in the Pacific, acquired information on Japanese military aircraft and weaponry, and partnered with the U.S. Army's Military Intelligence Division and the Federal Bureau of Investigation to monitor potentially subversive elements within the Japanese American community; ONI's director, Rear Admiral Walter Stratton Anderson, met weekly with his counterparts in the FBI and MID to gather and share information on suspected internal threats. In 1929, Chief of Naval Operations William D. Leahy made permanent ONI's functions as an intelligence office, while in 1939, President Franklin D. Roosevelt granted the office considerable authority on matters of domestic security.