Army Ground Forces in the context of "Army of the United States"

The Army Service Forces was one of the three autonomous components of the United States Army during World War II, the others being the Army Air Forces and Army Ground Forces, created on 9 March 1942. By dividing the Army into three large commands, the Chief of Staff, General George C. Marshall, drastically reduced the number of officers and agencies reporting directly to him. The Army Service Forces brought together elements of five different components of the Army: elements of the War Department General Staff (WDGS), especially its G-4 division (responsible for logistics); the Office of the Under Secretary of War; the eight administrative bureaus; the nine corps areas, which became service commands; and the six supply arms and services, which became known as the technical services. The Army Service Forces was initially known as the United States Army Services of Supply but the name was changed on 12 March 1943, as it was felt that the term "supply" did not accurately describe the broad range of its activities. The Army Service Forces was abolished on 11 June 1946 and most of its functions were taken over by the War Department General Staff.

For most of its existence, the Army Service Forces was commanded by General Brehon B. Somervell, with Lieutenant General Wilhelm D. Styer as his chief of staff. After Styer left for the Pacific, he was succeeded by Major General LeRoy Lutes on 18 April 1945. Brigadier General Lucius D. Clay was the Deputy Chief of Staff for Requirements and Resources, and as such he was responsible for the development of the Army Supply Program, the operation of the Lend-Lease program, and liaison with the War Production Board concerning the allocation of raw materials. Although he had his own logistics staff in the G-4 division of the War Department General Staff, it was to Somervell and Styer that Marshall turned to for advice on logistical matters, and it was Somervell who attended the important wartime conferences.

The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and de facto aerial warfare service branch of the United States during and immediately after World War II (1941–1947). It was created on 20 June 1941 as successor to the previous United States Army Air Corps and is the direct predecessor of the United States Air Force, today one of the six armed forces of the United States. The AAF was a component of the United States Army, which on 2 March 1942 was divided functionally by executive order into three autonomous forces: the Army Ground Forces, the United States Army Services of Supply (which in 1943 became the Army Service Forces), and the Army Air Forces. Each of these forces had a commanding general who reported directly to the Army chief of staff.

The AAF administered all parts of military aviation formerly distributed among the Air Corps, General Headquarters Air Force, and the ground forces' corps area commanders and thus became the first air organization of the U.S. Army to control its own installations and support personnel. The peak size of the AAF during World War II was over 2.4 million men and women in service and nearly 80,000 aircraft by 1944, and 783 domestic bases in December 1943. By "V-E Day", the Army Air Forces had 1.25 million men stationed overseas and operated from more than 1,600 airfields worldwide.

The United States Army Forces Command (FORSCOM) was the largest command of the United States Army. It provided land forces to the Department of Defense's unified combatant commands. FORSCOM was headquartered at Fort Bragg, North Carolina, and consisted of more than 750,000 active Army, U.S. Army Reserve, and Army National Guard soldiers. It was created on 1 July 1973 from the former Continental Army Command (CONARC), which in turn supplanted Army Field Forces and Army Ground Forces.

FORSCOM was disestablished on 5 December 2025, the same time as the Army standing up U.S. Army Western Hemisphere Command (USAWHC).

The European Theater of Operations, United States Army (ETOUSA) was a theater of Operations responsible for directing United States Army operations throughout the European theatre of World War II, from 1942 to 1945. It commanded Army Ground Forces (AGF), United States Army Air Forces (USAAF), and Army Service Forces (ASF) operations north of Italy and the Mediterranean coast. It was bordered to the south by the North African Theater of Operations, United States Army (NATOUSA), which later became the Mediterranean Theater of Operations, United States Army (MTOUSA).

The term theater of operations was defined in the US Army field manuals as the land and sea areas to be invaded or defended, including areas necessary for administrative activities incident to the military operations. In accordance with the experience of World War I, it was usually conceived of as a large land mass over which continuous operations would take place and was divided into two chief areas-the combat zone, or the area of active fighting, and the Communications Zone, or area required for administration of the theater. As the armies advanced, both these zones and the areas into which they were divided would shift forward to new geographic areas of control.