formations include 9 economic construction divisions, 1 logistical regiment, 1 medical unit and 1 training regiment. Ross wrote in 1984 that economic construction division "are composed of regular troops that are fully trained and armed, and reportedly they are subordinate to their own directorate in the Ministry of Defense. They have specific military missions; however, they are also entrusted with economic tasks such as food production or construction work. They are composed partially of older veterans." Ross also cited 1980s sources saying that economic construction divisions each had a strength of about 3,500. In 2017, the listing was amended, with the addition of a single Short-range ballistic missile brigade. The ground forces according to the IISS, hold Scud-B/C SRBMs. 1st Corps – Binh đoàn Quyết thắng (Corps of the Determined Victory): First organised on 24 October 1973 during the Vietnam War, the 1st Corps had a major role in the Ho Chi Minh Campaign that ended the war. It is stationed in Tam Điệp District, Ninh Bình. The combat forces of the corps include: 308th Division 312th Infantry Division 390th Division 367th Air Defence Division 202nd Tank Brigade 45th Artillery Brigade 299th Engineer Brigade 2nd Corps – Binh đoàn Hương Giang (Corps of the Perfume River): First organised on 17 May 1974 during the Vietnam War, the 2nd Corps had a major role in the Ho Chi Minh Campaign that ended the war. Stationed in Lạng Giang District, Bắc Giang. The combat forces of the corps include: 304th Division 306th Infantry Division 325th Division 673rd Air Defence Division 203rd Tank Brigade 164th Artillery Brigade 219th Engineer Brigade 3rd Corps – Binh đoàn Tây Nguyên (Corps of the Central Highlands): First organised on 26 March 1975 during the Vietnam War, 3rd Corps had a major role in the Ho Chi Minh Campaign and the Cambodian–Vietnamese War. Stationed in Pleiku, Gia Lai. The combat forces of the corps include: 10th Infantry Division 31st Infantry Division 320th Infantry Division 312th Air Defence Regiment 273rd Tank Regiment 675th Artillery Regiment 198th Commando Regiment 29th Signal Regiment 545th Engineer Regiment 4th Corps – Binh đoàn Cửu Long (Corps of the Mekong): First organised 20 July 1974 during the Vietnam War, 4th Corps had a major role in the Ho Chi Minh Campaign and the Cambodian–Vietnamese War. Stationed in Dĩ An, Bình Dương. The combat forces of the corps include: 7th Infantry Division 9th Infantry Division