The 101st Airborne Division is a U.S. Army modular infantry division trained for air assault operations. During World War II, it was renowned for action during the Normandy Landings, Operation Market Garden, and in the Battle of the Bulge. The 101st Division headquarters was organized 2 November 1918 at Camp Shelby, Mississippi. It was later reconstituted in the Organized Reserves, and organized on 10 September 1921, at Milwaukee, Wisconsin. The 101st Airborne Division was activated on August 16, 1942, at Camp Claiborne, Louisiana. It was reactivated as a training unit at Camp Breckinridge, Kentucky, in 1948 and again in 1950. It was once again reactivated in 1954 at Fort Jackson, South Carolina, and in March 1956, the 101st was transferred, to Fort Campbell, Kentucky, to be reorganized as a combat division. The 101st was reactivated with five battle groups in place of its World War II structure that featured regiments and battalions. The reorganization was in place by late April 1957, and the division's current main battle groups are: 1st Brigade Combat Team - 327th Infantry (♣) 2d Brigade Combat Team - 502nd Infantry (♥) 3d Brigade Combat Team - 187th Infantry (⛩️) 4th Brigade Combat Team - 506th Infantry (♠) Combat Aviation Brigade - (♦) Headquarters and Headquarters Battalion Division Artillery Sustainment Brigade