Seventeenth Army
Aoba Detachment () was the reinforced 4th Infantry Regiment/IJA 2nd Division, a part of the Seventeenth Army. The commander of the Aoba Detachment was Major General Yumio Nasu, the commander of the 2nd Division's Infantry Group. Unlike other detachments which were usually named after their commander, the Aoba Detachment is thought to have been named after Mt. Aoba in Sendai, hometown of the 4th Infantry Regiment.