The 33d Infantry Division was a formation of the U.S. Army National Guard between 1917 and 1968. It was briefly active as the 12th Division before becoming the 33rd Division. In 2006, the 33rd Infantry Brigade Combat Team was re-activated under the Transformation of the United States Army and subordinated to the Illinois Army National Guard. The 33rd Infantry Brigade Combat Team deployed to Afghanistan in December 2008 in support of Operation Enduring Freedom and re-deployed in August 2009.