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.

Built in 1827, Fort Leavenworth was originally established to protect the Santa Fe Trail during the westward expansion of settlers in the early 19th century. It was used as a training camp during the Civil War, although it never came under direct Confederate assault. It was during the late 19th century the installation began what would become its two most well-known functions: as a prison for soldiers, and a school for the training of infantry and cavalry officers. During World War I and II, graduates of the Command and General Staff College included Generals Patton, Bradley and Eisenhower. They, along with numerous others, showed the great strategic value in the school and its curriculum.

Today, in addition the school and the Military Corrections Complex, other tenants of Fort Leavenworth include the US Army's Combined Arms Center and other units of the Army's Training and Doctrine Command.

Established in 1922, the initial air units stationed at Wheeler Field were photo reconnaissance and fighter squadrons. By 1940, the primary units stationed at Wheeler were fighter squadrons, making it a prime target for the Japanese when they attacked Pearl Harbor in 1941. Wheeler came under the control of the Air Force in 1947, and was returned to the Army in 1991.

Today Wheeler Army Airfield houses the 25th Infantry Division's Combat Aviation Brigade, as well as various cargo and air ambulance units.

Originally founded as a local municipal airport, the Army built a base at the field in 1940, and was used to train both bomber and anti-submarine aircrews during World War II. From 1949-1967 the airfield was known as Hunter Air Force Base, and was used by the Strategic Air Command until the Army took over in 1967.

Today Hunter Army Airfield is part of Fort Stewart, and as such primarily houses the aviation units of the 3rd Infantry Division. Hunter Army Airfield also allows the 3rd Infantry Division to quickly and efficiently deploy units worldwide

Opened in 1941, Los Alamitos was originally a Naval Reserve Air Base and then in 1943, a Naval Air Station. During World War II it was responsible for training aviation cadets and maintenance of fleet aircraft. The base was used for training of naval aviators up until 1973, when ownership transferred from the Navy to the Army, and the base was renamed Los Alamitos Army Airfield.

Today Los Alamitos is the headquarters of the 63rd Regional Support Command and is the home of the California Army National Guard's 40th Infantry Division.

Established in 1942, shortly after the outbreak of World War II Fort Rucker was originally used to train infantry units before deploying overseas in support of the war effort during WWII and Korea. In 1959, the Hanchey Army Heliport at Fort Rucker became the home of the Department of Rotary Wing Training of the Army Aviation School.

Today Fort Rucker is still the home of the US Army Aviation Center of Excellence (USAACE) which trains, develops and tests all rotary-wing aircraft and their pilots for the Army. In addition the Warrant Officer Candidate School and Warrant Officer Career College are also located at Fort Rucker.

Established in 1941, shortly before entering World War II, Redstone Arsenal was used to manufacture chemical weapons, incendiary devices, tear gas, and small rockets. In 1949 Redstone Arsenal became the home of the US Army Ordnance Rocket Center, and used research and scientists brought from Germany to quickly test and begin work on ballistic missiles. Research on ballistic missiles has been a major part of Redstone Arsenal's work, at various times Redstone has housed the Ordnance Guided Missile School, the Army Ballistic Missile Agency, the Army Ordnance Missile Command, and the Army Missile Command.

Today Redstone Arsenal is still at the forefront of missile research, housing the Missile Defense Agency, Missile and Space Intelligence Center, and the Marshall Space Flight Center, which is NASA's field center for propulsion development.