The 21st Public Security Division(Chinese: 公安第21师) was created in January 1951 from 3 security regiments of Shandong Military District and a regiment from Shangqiu Military Sub-district.

The division was composed of three regiments, with a total of 7221 personnel:

• 61st Public Security Regiment;
• 62nd Public Security Regiment;
• 63rd Public Security Regiment.

The division was a part of Railway Public Security Forces, guarding the railway lines and complexes in northern China area.^[1]

In January 1955, the division moved to Pulandian, Liaoning. In March the division was attached to 64th Corps and renamed as 190th Infantry Division(Chinese: 步兵第190师) following the 1st formation of 190th Infantry Division's re-designation.

The division was then composed of:

• 568th Infantry Regiment (former 61st Public Security);
• 569th Infantry Regiment (former 62nd Public Security);
• 570th Infantry Regiment (former 63rd Public Security);
• 570th Artillery Regiment.^[2]

In 1960, the division was disbanded following 1st Mechanized Division's re-attachment to the Army Corps.

• The divisional HQ and its 568th Infantry Regiment were re-organized as Air Force Engineering Academy;
• Its 569th Infantry Regiment was converted to 129th Engineer Construction Regiment
• 570th Infantry Regiment was transferred to Jilin Provincial Military District, later expanded to 213th Army Division;
• 570th Artillery Regiment was transferred to Lvda Security District's control.

• 建国后中国人民解放军步兵师的发展（2011年版），http://club.xilu.com/zgjsyj/msgview-819697-74513.html