United States Army

U.S. ArmyUS ArmyArmyU. S. ArmyUSAAmerican ArmyAmericanUnited StatesAmerican troopssoldiers
The United States Army (USA) is the land warfare service branch of the United States Armed Forces.wikipedia
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Army of the United States

ArmyNational ArmyAUS
It is one of the seven uniformed services of the United States, and is designated as the Army of the United States in the United States Constitution.
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 United States National Guard), but it has been inactive since the suspension of the draft in 1973 and the U.S. military's transition to a volunteer force.

United States Department of the Army

Department of the ArmyU.S. Department of the ArmyArmy
As a uniformed military service, the U.S. Army is part of the Department of the Army, which is one of the three military departments of the Department of Defense.
The Department of the Army is the Federal Government agency within which the United States Army is organized, and it is led by the Secretary of the Army, who has statutory authority under to conduct its affairs and to prescribe regulations for its government, subject to the limits of the law, and the directions of the Secretary of Defense and the President.

United States Army Reserve

Army ReserveU.S. Army ReserveOrganized Reserve
It is the largest military branch, and in the fiscal year 2017, the projected end strength for the Regular Army (USA) was 476,000 soldiers; the Army National Guard (ARNG) had 343,000 soldiers and the U.S. Army Reserve (USAR) had 199,000 soldiers; the combined-component strength of the U.S. Army was 1,018,000 soldiers.
The United States Army Reserve (USAR) is a reserve force of the United States Army.

Regular Army (United States)

Regular ArmyRegularregulars
It is the largest military branch, and in the fiscal year 2017, the projected end strength for the Regular Army (USA) was 476,000 soldiers; the Army National Guard (ARNG) had 343,000 soldiers and the U.S. Army Reserve (USAR) had 199,000 soldiers; the combined-component strength of the U.S. Army was 1,018,000 soldiers. The Regular Army was at first very small and after General St. Clair's defeat at the Battle of the Wabash, where more than 800 Americans were killed, the Regular Army was reorganized as the Legion of the United States, which was established in 1791 and renamed the United States Army in 1796.
Even in modern times the professional core of the United States Army continues to be called the Regular Army.

Reorganization plan of United States Army

Transformation of the United States ArmytransformationForce XXI
Modernization, reform for high-intensity conflict, and Joint multi-domain operations are added to the strategy, to be completed by 2028.
The reorganization plan of the United States Army is a current modernization and reorganization plan of the United States Army that was implemented under the direction of Brigade Modernization Command.

Continental Army

ContinentalContinental soldiersContinentals
As the oldest and most senior branch of the U.S. military in order of precedence, the modern U.S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (1775–1783)—before the United States of America was established as a country.
This became the foundation of the United States Army in 1796.

United States Secretary of the Army

Secretary of the ArmyU.S. Secretary of the ArmyOffice of the Secretary of the Army
The U.S. Army is headed by a civilian senior appointed civil servant, the secretary of the Army (SECARMY) and by a chief military officer, the chief of staff of the Army (CSA) who is also a member of the Joint Chiefs of Staff.
The secretary of the Army (SA, SECARM or SECARMY) is a senior civilian official within the Department of Defense of the United States with statutory responsibility for all matters relating to the United States Army: manpower, personnel, reserve affairs, installations, environmental issues, weapons systems and equipment acquisition, communications, and financial management.

Chief of Staff of the United States Army

Army Chief of StaffChief of Staff of the ArmyU.S. Army Chief of Staff
The U.S. Army is headed by a civilian senior appointed civil servant, the secretary of the Army (SECARMY) and by a chief military officer, the chief of staff of the Army (CSA) who is also a member of the Joint Chiefs of Staff.
The Chief of Staff of the Army (CSA) is a statutory office held by a four-star general in the United States Army.

Army National Guard

United States Army National GuardNational GuardU.S. Army National Guard
It is the largest military branch, and in the fiscal year 2017, the projected end strength for the Regular Army (USA) was 476,000 soldiers; the Army National Guard (ARNG) had 343,000 soldiers and the U.S. Army Reserve (USAR) had 199,000 soldiers; the combined-component strength of the U.S. Army was 1,018,000 soldiers.
If mobilized for federal service, the member or unit becomes part of the Army National Guard of the United States, which is a reserve component of the United States Army.

Uniformed services of the United States

uniformed servicesUnited States uniformed servicesuniformed service
It is one of the seven uniformed services of the United States, and is designated as the Army of the United States in the United States Constitution.

United States Military Academy

West PointU.S. Military AcademyArmy
State militias became the new nation's sole ground army, with the exception of a regiment to guard the Western Frontier and one battery of artillery guarding West Point's arsenal.
The campus is a popular tourist destination, with a visitor center and the oldest museum in the United States Army.

Joint Modernization Command

Brigade Modernization CommandJMCBrigade Modernization
While the Army Mission remains constant, the Army Strategy builds upon the Army's Brigade Modernization by adding focus to Corps and Division-level echelons.
Joint Modernization Command is subordinate to the Army Futures & Concepts Center in Joint Base Langley-Eustis, Virginia; both report to the U.S. Army's newest Four-Star Command, the Army Futures Command (AFC) based in Austin, Texas.

Legion of the United States

1st Sub-LegionLegion300 man detachment
The Regular Army was at first very small and after General St. Clair's defeat at the Battle of the Wabash, where more than 800 Americans were killed, the Regular Army was reorganized as the Legion of the United States, which was established in 1791 and renamed the United States Army in 1796.
The modern 1st, 3rd, and 4th United States Infantry Regiments of the United States Army trace their lineage to the Legion of the United States.

Battle of Plattsburgh

Battle of Lake ChamplainBattle of PlattsburgPlattsburgh
The regular army, however proved they were professional and capable of defeating the British army during the invasions of Plattsburgh and Baltimore, prompting British agreement on the previously rejected terms of a status quo ante bellum.
A British army under Lieutenant General Sir George Prévost and a naval squadron under Captain George Downie converged on the lakeside town of Plattsburgh, which was defended by New York and Vermont militia and detachments of regular troops of the United States Army, all under the command of Brigadier General Alexander Macomb, and ships commanded by Master Commandant Thomas Macdonough.

Union Army

UnionUnion troopsUnion forces
Forces of the United States (the "Union" or "the North") formed the Union Army, consisting of a small body of regular army units and a large body of volunteer units raised from every state, north and south, except South Carolina.
During the American Civil War, the Union Army referred to the United States Army, the land force that fought to preserve the Union of the collective states.

Robert E. Lee

LeeGeneral Robert E. LeeGeneral Lee
Grant took command of Union forces in 1864 and after a series of battles with very heavy casualties, he had General Robert E. Lee under siege in Richmond as General William T. Sherman captured Atlanta and marched through Georgia and the Carolinas.
A son of Revolutionary War officer Henry "Light Horse Harry" Lee III, Lee was a top graduate of the United States Military Academy and an exceptional officer and military engineer in the United States Army for 32 years.

Confederate States Army

ConfederateConfederate ArmyConfederates
After most slave states, located in the southern U.S., formed the Confederate States, the Confederate States Army, led by former U.S. Army officers, mobilized a large fraction of Southern white manpower.
On March 1, 1861, on behalf of the Confederate government, Davis assumed control of the military situation at Charleston, South Carolina, where South Carolina state militia besieged Fort Sumter in Charleston harbor, held by a small U.S. Army garrison.

Arizona

AZState of ArizonaArizona, U.S.
The U.S. victory resulted in acquisition of territory that eventually became all or parts of the states of California, Nevada, Utah, Colorado, Arizona, Wyoming and New Mexico.
During the Mexican–American War (1847–1848), the U.S. Army occupied the national capital of Mexico City and pursued its claim to much of northern Mexico, including what later became Arizona Territory in 1863 and later the State of Arizona in 1912.

Siege of Fort St. Philip (1815)

Siege of Fort St. PhilipFort St Philipbattle
Two weeks after a treaty was signed (but not ratified), Andrew Jackson defeated the British in the Battle of New Orleans and Siege of Fort St. Philip, and became a national hero.
However, to reach New Orleans, the destruction of the small U.S. Navy squadron in the area and the U.S. Army forts and batteries was necessary.

Pancho Villa Expedition

Mexican ExpeditionPunitive ExpeditionMexican Punitive Expedition
In 1916, Pancho Villa, a major rebel leader, attacked Columbus, New Mexico, prompting a U.S. intervention in Mexico until 7 February 1917.
The Pancho Villa Expedition—now known officially in the United States as the Mexican Expedition, but originally referred to as the "Punitive Expedition, U.S. Army" —was an unsuccessful military operation conducted by the United States Army against the paramilitary forces of Mexican revolutionary Francisco "Pancho" Villa from March 14, 1916, to February 7, 1917, during the Mexican Revolution of 1910–1920.

Reconstruction era

ReconstructionpostbellumCongressional Reconstruction
U.S. Army troops also occupied several Southern states during the Reconstruction Era to protect freedmen.
A Republican coalition came to power in nearly all the Southern states and set out to transform the society by setting up a free labor economy, using the U.S. Army and the Freedmen's Bureau.

George Marshall

George C. MarshallMarshallGeneral George C. Marshall
General George C. Marshall became Army Chief of Staff in September 1939 and set about expanding and modernizing the Army in preparation for war.
He rose through the United States Army to become Chief of Staff under presidents Franklin D. Roosevelt and Harry S. Truman, then served as Secretary of State and Secretary of Defense under Truman.

Florida

FLState of FloridaFloridian
The army's major campaign against the Indians was fought in Florida against Seminoles.
The United States Army led increasingly frequent incursions into Spanish territory, including the 1817–1818 campaign against the Seminole Indians by Andrew Jackson that became known as the First Seminole War.

American entry into World War I

enteredUnited States' entry into World War IUnited States entered World War I
The United States joined World War I as an "Associated Power" in 1917 on the side of Britain, France, Russia, Italy and the other Allies.
Until 1917, Wilson made minimal preparations for a land war and kept the United States Army on a small peacetime footing, despite increasing demands for enhanced preparedness.

United States Marine Corps

U.S. Marine CorpsMarinesMarine Corps
In the Pacific War, U.S. Army soldiers participated alongside the United States Marine Corps in capturing the Pacific Islands from Japanese control.
The United States Marine Corps (USMC), also referred to as the United States Marines, is a branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations with the United States Navy as well as the Army and Air Force.