31st Army ( People ' s Republic of China ) The 31st Group Army is a military formation of China ' s People ' s Liberation Army and one of three active group armies belonging to the Nanjing Military Region . It is based at Xiamen , Fujian and is composed of the 86th Infantry Division and the 91st Motorized Infantry Division , along with an armored brigade , an air defense brigade , a surface - to - air missile regiment , an artillery regiment , and an engineer regiment . It is considered a Category A unit , with priority status in terms of readiness , strength , and modern equipment . Based on its training activities and positioning , its primary mission is presumed to be the invasion of Taiwan . Its unit ID number is 73111 . History . The 31st Group Army traces its lineage to the Shantung Column of the Shantung Military Region which was formed around 1941 . By 1945 the column had been reorganized and redesignated into several military districts , including the Chiao - Tung Military District . By 1946 , elements of the Chiao - Tung MD were reorganized and redesignated 9th and 13th Columns . The 13th Column , commanded by Chou Chih - chien was composed of three divisions , including the 37th , 38th , and 39th . In the mid - to - late 1940s the 13th Column was reorganized and redesignated as the 31st Corps , also commanded by Chou Chih - chien . The 31sr Corps was composed of the 91st , 92nd and 93rd Divisions . In late 1949 the 31st Corps , under the 10th Army , took part in the Chekiang and Fukien Campaign conducting operations against or near Nanp ' ing , Kut ' ien and the Changchou - Amoy area . During the Korean War the 31st Corps was on of the few units to remain in China opposite Taiwan to defend against a potential US - Taiwan Invasion . The 31st was stationed in Fujian . In 1958 , elements of the 31st Group Army took part in the artillery bombardment of Jinmen and Mazu that precipitated the Second Taiwan Strait Crisis . Current . The 31st Army Group is currently one of the three army groups assigned to the Nanjing Military Region . From mid - July 1991 thru May 1992 elements of the 31st Group Army conducted a variety of exercises and operations in the Nanjing Military Region according to the Chinese Council of Advanced Politics . In mid - July 1991 in the Longhai area of Fujian Province , a regiment from the 91st Division conducted routine training and armed swimming training in an effort to improve the units amphibious warfare capability . Also in July 1991 , the reconnaissance battalion of the 86th Infantry Division along with soldiers from the Zhugong area conducted similar training in the Xiaocheng and Dacheng areas Lianjiang Xian , Fujian Province . In early October 1991 the 258th Regiment of the 86th Infantry Division , along with units from various military sub - districts , conducted defensive exercises and combined militia exercises in the Banding Area , Lianjiang Xian , Fujian Province . In mid October thru early November 1991 the 92nd and 93rd Infantry Divisions ( since disbanded ) of the 31st Group Army conducted routine training and field training activities in the Fuzhou area of Changpu and Nanan . In early April 1992 the signal corps of the 31st Signal Regiment conducted routine training and an overall signal training and evaluation between veterans and replacements in Xiamen , Fujian Province . Elements of the 31st Group Army took part in Exercise 96 - 1 , the military exercises that took place in the Taiwan Straits in 1996 .