An army comprises all of a nation's land-based military
forces or a specific large military force.
Military land forces
An army is a military organization. The word army can refer
to any armed force, or more specifically a force primarily
designed for land-based war.
Most (but not all) armed forces make considerable organizational
distinction between the land-based warfare of an army, the
sea-based warfare of a navy, and the air-based warfare of
an air force - often splitting the three components into
mostly independent forces.
This convention can vary widely between nations and can
change over time. For example, the People's Liberation Army
of China controls the Chinese air force and navy,
which are actually called the People's Liberation Army Navy
and the People's Liberation Army Air Force. The ancestor
of the United States Air Force was the United States Army
Modern armies use infantry, armoured fighting vehicles
(e.g. tanks), artillery, and aircraft (usually helicopters).
An army can also be a large military unit. When used in
this sense, the army is named or numbered to distinguish
it from military land forces in general - for example, 1st
Army and The Army of Northern Virginia.
The hierarchy of large land force units is:
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