The 106th Cavalry Group (later reorganized as a regiment) was a mechanized cavalry unit of the United States Army in World War II. The 106th Cavalry Group had previously been known as the 1st Regiment Illinois Volunteer Cavalry during the Spanish American War and World War I and was constituted in 1921 as part of the Illinois National Guard. It underwent a number of reorganizations before World War II. Like other guard units during the inter-war years, the 106th held monthly drills and yearly training. Readiness for war in 1940 led to the mechanization of the unit and induction into Federal Service at Camp Livingston, Louisiana on 25 November 1940.