20,000 and 35,000 fatalities, though other figures still maintain fatalities could have been as high as 200,000. A report commissioned by the U.S. Air Force, estimated 10,000-12,000 Iraqi combat deaths in the air campaign and as many as 10,000 casualties in the ground war. This analysis is based on Iraqi prisoner of war reports. It is known that between 20,000 and 200,000 Iraqi soldiers were killed. According to the Project on Defense Alternatives study, 3,664 Iraqi civilians and between 20,000 and 26,000 military personnel were killed in the conflict. 75,000 Iraqi soldiers were wounded in the fighting. The International Institute for Strategic Studies (IISS) estimated the army's composition immediately after the 1991 war as six 'armoured'/'mechanised' divisions, 23 infantry divisions, eight Republican Guard divisions and four Republican Guard internal security divisions. Jane's Defence Weekly for 18 July 1992 stated that 10,000 troops from five divisions were fighting against Shia Muslims in the southern marshlands. The IISS gave the Iraqi Army's force structure as of 1 July 1997 as seven Corps headquarters, six armoured or mechanised divisions, 12 infantry divisions, six RGF divisions, four Special Republican Guard Brigades, 10 commando, and two Special Forces Brigades. It was estimated to number 350,000 personnel, including 100,000 recently recalled reservists. U.S. invasion 2003 In the days leading up to the U.S. 2003 invasion of Iraq and the following Iraq War, the army consisted of 375,000 troops, organized into five corps. In all, there were 11 infantry divisions, 3 mechanized divisions, and 3 armored divisions. The Republican Guard consisted of between 50,000 and 60,000 troops (although some sources indicate a strength of up to 80,000). In January 2003, before the start of the invasion of Iraq in March 2003, the force was primarily located in eastern Iraq. The five corps were organised as follows: 1st Corps, near Kirkuk consisted of the 5th Mechanized Division, 2nd Infantry Division, 8th Infantry Division and the 38th Infantry Division. 2nd Corps, near Diyala (CNN) had the 3rd Armored Division (HQ Jalawia), 15th Infantry Division (HQ Amerli), and 34th Infantry Division. 3rd Corps, near An Nasiriyah and the Kuwaiti border, had the 6th Armored Division, the 51st Mechanized Division, and the 11th Infantry Division. The 11th Infantry Division defended An Nasiriyah and As Samawah to the southeast on the approaches to An Nasiriyah. 4th Corps, near Amarah and the border with Iran, included the 10th Armored Division, 14th Infantry Division