The 9th Infantry Division (Division) was first activated during World War I, but was never deployed to Europe.  Soon after the Great War, the Division was demobilized in 1919 and re-designated a regular Army unit in 1923 and placed on the inactive list.

On August 1, 1940, the 9th Division was reactivated and began training at Ft. Bragg, NC.  The 9th Division was re-designated 9th Infantry Division August 1, 1942 and was deployed to North Africa in November 1942.  The Division fought in eight campaigns in the European Theater from North Africa to the Elbe River in eastern Germany which included an amphibious landing in Sicily.  The Division endured 23,277 causalities during WWII, the second highest causality rate among the 91 divisions during the war. (Source: Army Battle Casualties & Non-battle Deaths in WWII, Final Report, 1 December 1941-31 December 1946 Mediterranean & Europe.)

The Division was deactivated in January 1947 and then six months later was reactivated as a training division.  In 1966 the Division was reactivated for deployment to Vietnam under General William C. Westmoreland, a veteran of the 47th Infantry Regiment and part of the 9th Division during WWII.  The Division incurred 2,624 causalities and was inactivated in 1969, then reactivated in 1972 and served as an equipment testing Division at Ft. Lewis, Washington until 1991.

The Association was formed by the officers and men in May/June 1945 immediately following the conclusion of hostilities in Germany.  The first reunion was held in New York City the next year and has held a national reunion every year since. The 75th Reunion will be held at Ft. Bragg next year.  Recently, the Association changed from a 501(C) 19 veterans group to a 501(C) 3 not-for-profit group.