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A division is a large military unit or formation, usually consisting of between 10,000 and 25,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps. Historically, the division has been the default combined arms unit capable of independent operations.
In the United States Army, a brigade is smaller than a division and roughly equal to or a little larger than a regiment. During the American Civil War infantry brigades contained two to five regiments with the idea being to maintain a unit with a strength of 2,000 soldiers [10] and were usually commanded by a brigadier general or a senior ...
The US Army reorganized as triangular divisions of three infantry regiments and "division artillery" of three 105 mm howitzer battalions and one 155mm battalion from late 1939 to early 1942. After the army's conversion to the triangular division, only two separate brigades were formed during World War II, the 1st Airborne Infantry Brigade and ...
Until the brigade combat team program was developed, the division was the smallest self-sufficient level of organization in the U.S. Army. Current divisions are "tactical units of employment", and may command a flexible number of modular units, but generally will include three brigade combat teams and a combat aviation brigade, supported by a ...
For the first time, the division was the base element of the United States Army and remained as such until the Global War on Terrorism, when the Army switched its emphasis to brigades and brigade combat teams. Since the authorizations of permanent divisions, the United States Army has raised 128 separate divisions with unique lineages.
The use of formalized ranks in a hierarchical structure came into widespread use with the Roman Army. [citation needed]In modern times, executive control, management and administration of military organization is typically undertaken by governments through a government department within the structure of public administration, often known as a ministry of defence or department of defense.
In the first decade of the 21st century, the United States Army began another reorganization, giving the division four brigades and placing more emphasis on the brigade as the main tactical element, with the division acting more like a corps headquarters, parceling out support units to the brigades.
A field army (also known as numbered army or simply army) is a military formation in many armed forces, composed of two or more corps. It may be subordinate to an army group. Air armies are the equivalent formations in air forces, and fleets in navies. A field army is composed of 80,000 to 300,000 soldiers.