Fort Campbell opened in early 1942, and was immediately put to use training three armored and one infantry division, in support of the war effort in Europe and the Pacific. After World War II, Fort Campbell continued to grow, and in 1956 the 101st Airborne Division was reactivated, with Fort Campbell as their home. Other tenant units at Fort Campbell include the 5th Special Forces Group, the 160th Special Operations Aviation Regiment (SOAR), and the 57th Explosive Ordance Disposal Group.