The Japanese Imperial Army had Independent Mixed Brigades that were detachments made of various units detached from other units or independent support units formed together in an independent brigade.
Later a series of Independent Mixed Brigades were formed for the purpose of garrisoning the large territories of China captured in the early phase of the Second Sino-Japanese War. This variety for China was usually organized with five infantry battalions, an artillery unit, and labor troops. In the Pacific theater they had different and more varied configurations of subodinate units.
IJA Independent Mixed Brigades, formed by the Kwangtung army in the 1930s: