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Military history is the study of armed conflict in the history of humanity, and its impact on the societies, cultures and economies thereof, as well as the resulting changes to local and international relationships.
An army, [1] ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by possessing an army aviation component.
The Army of the United States is one of the four major service components of the United States Army (the others being the Regular Army, the United States Army Reserve and the Army National Guard of the United States ), [1] but it has been inactive since the suspension of the draft in 1973 and the U.S. military's transition to a volunteer force. [2]
Military operations are managed by eleven regional or functional unified combatant commands. The Department of Defense also operates several joint services schools, including the Eisenhower School (ES) and the National War College (NWC).