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The United States Army (USA) is the primary land service branch of the United States Armed Forces. It is designated as the Army of the United States in the United States Constitution . [ 14 ] It is one of the six armed forces and one of the eight Uniformed services of the United States .
Originally established in 1947 when it gained independence from the U.S. Army, it traces its history back through the United States Army Air Forces, United States Army Air Corps, United States Army Air Service, the Division of Military Aeronautics, Aviation Section, U.S. Signal Corps, to the birth of Aeronautical Division, U.S. Signal Corps on ...
As military forces around the world are constantly changing in size, no definitive list can ever be compiled. All of the 172 countries listed here, especially those with the highest number of total soldiers such as the two Koreas and Vietnam , include a large number of paramilitaries, civilians and policemen in their reserve personnel.
The United States Department of Defense (DoD, [2] USDOD, or DOD) is an executive branch department of the federal government of the United States charged with coordinating and supervising the five U.S. armed services, the Army; Navy; Marines; Air Force; Space Force; the Coast Guard for some purposes, and related functions and agencies.
As defined by the U.S. Central Intelligence Agency, "fit for military service" means all citizens of a country (both male and female) between the ages of 16 and 49 that are not otherwise disqualified for health reasons. [1]
This is a list of current formations of the United States Army, which is constantly changing as the Army changes its structure over time. Due to the nature of those changes, specifically the restructuring of brigades into autonomous modular brigades, debate has arisen as to whether brigades are units or formations; for the purposes of this list, brigades are currently excluded.
Reserve components of the United States Armed Forces are all members of the military who serve in a reserve capacity. The National Guard is an additional reserve military component of the Army and Air Force, respectively, and is composed of National Guard units, which operate under Title 32 and under state authority as the Army National Guard ...
The military of the United States is deployed in most countries around the world, with approximately 160,000 of its active-duty personnel stationed outside the United States and its territories. [1] This list consists of deployments excepting active combat deployments , including troops in Iraq, Syria, Yemen, and Somalia.