The 1st Independent Mixed Brigade or 1st Mixed Brigade (獨立混成第1旅團) was an experimental combined arms formation of the Imperial Japanese Army.
After being promoted lieutenant general Masaomi Yasuoka took command from 1938 to 1939.
Major General Suzuki Teiji assumed command in 1941.
[1] By 1944 defense of the Japanese homeland prompted the creation of the inner line of defense extending northward from the Carolines, the Marianas, and the Ogasawara Islands.
The brigade was assigned to the 31st Army under General Hideyoshi Obata.