reorganized as a motorized army division. Tank Regiment, 81st Army Division and AAA Regiment, 81st Army Division were activated. By then the division was composed of: 241st Infantry Regiment; 242nd Infantry Regiment; 243rd Infantry Regiment; Tank Regiment; Artillery Regiment; Anti-Aircraft Artillery Regiment. In August 1985, the division was renamed as the 81st Motorized Infantry Division () and reorganized as a motorized division, category B. 250th Infantry Regiment of the disbanding 84th Army Division was attached to the division. Tank Regiment, 81st Division detached to form Tank Brigade, 27th Army. Tank Regiment, 66th Army Corps was transferred to the division as the new Tank Regiment, 81st Division. By then the division was composed of: 241st Infantry Regiment; 242nd Infantry Regiment; 243rd Infantry Regiment; 250th Infantry Regiment; Tank Regiment; Artillery Regiment; Anti-Aircraft Artillery Regiment. In September 1989, the division was converted to a northern motorized division, category B. 250th Infantry Regiment was disbanded. In September 1996, the division was transferred to the People's Armed Police and renamed as the 81st Armed Police Mobile Division (): 241st, 242nd, and 243rd Infantry Regiments were converted to 241st, 242nd, and 243rd Armed Police Regiments, respectively; Tank Regiment, 81st Infantry Division was transferred to 27th Army's direct control as Former Tank Regiment, 81st Division. In September 1998 the regiment was disbanded. Artillery Regiment and Anti-Aircraft Artillery Regiment were merged into 702nd Armed Police Regiment. The division was then composed of: 241st Armed Police Regiment - Jinnan District, Tianjin; 242nd Armed Police Regiment - Cangzhou, Hebei; 243rd Armed Police Regiment - Jinnan District, Tianjin; 702nd Armed Police Regiment - Xiqing District, Tianjin. After the 2017 reform, the division was reduced to a detachment (regiment-sized): the 4th Mobile Detachment () under the PAP 1st Mobile Corps (). References 陆军第27集团军军史编纂委员会, 《陆军第27集团军军史》, 1998, p. 805-824 Units and formations of the People's Armed Police