The United States ten major divisions:

1, the United States 1st Cavalry Division: nicknamed the "first team"

Affiliated with the Army's 3rd Corps. The division was formally established in September 1929, is the U.S. Army rapid reaction force in one of the two heavy division. It has participated in World War II, the Korean War, the Vietnam War and the Gulf War.

2, the U.S. 1st Armored Division: nicknamed "The Brave"

Attached to the Army's 5th Army. The division was established in July 1940, is the United States Army armored forces established the earliest troops, but also at present the United States Army's only armored division. It has participated in World War II, the Gulf War, and peacekeeping operations in Bosnia and Herzegovina.

3, the U.S. 1st Mechanical Infantry Division: nicknamed "Big Red"

Under the Army 7th Army Group. The division was born on May 24, 1917, and was known as the 1st U.S. Expeditionary Division.

4, U.S. Army 2nd Mechanized Infantry Division: nicknamed "Indian Head"

is the U.S. Pacific Headquarters under the jurisdiction of the two infantry divisions, based in South Korea, but also the only U.S. infantry divisions in the Western Pacific region.

5, the U.S. 3rd Mechanized Infantry Division: nicknamed the "Marlin Stone"

Established on November 21, 1917, stationed in the U.S. mainland at Fort Stewart, Georgia. The division was the last of the US Army's rapid reaction forces to be used in contingency operations, with its rapid mobility, great firepower and assault power, and protection against enemy heavy divisions that other light divisions did not possess.

6, the U.S. 4th Mechanized Infantry Division: nicknamed the "Ivy"

Attached to the 3rd Army, stationed in the U.S. mainland Fort Hood. The division is based on tanks and mechanized infantry as the main body, and includes the air assault force of all kinds of military composite forces, with rapid mechanical power, strong firepower and assault and armor protection, is the U.S. Army to support global military operations standby forces. The division is also the U.S. Army test in the information technology, digital conditions of operation of the experimental machine infantry division, generally do not participate in combat, only to do new equipment or new tactics of the exercise.

7, the U.S. 10th Mountain Division: nicknamed "Alpine"

Subordinate to the Army's 18th Airborne Corps. Stationed at Fort Drum in New York State, the United States mainland, is the only U.S. Army rapid reaction maneuver unit to carry out mountain combat missions. The division is a light infantry as the main body of the various branches of the synthesis of the force, the entire division of all formed equipment can be rapidly deployed by air, is the U.S. Army to carry out contingency combat missions of a rapid reaction force.

8, the U.S. 25th Light Infantry Division: nicknamed "Tropical Lightning"

Subordinate to the 8th Army Group, stationed in the U.S. mainland of Hawaii, Schofield Barracks.

9, the U.S. 82nd Airborne Division: nicknamed "All Americans"

Affiliated with the U.S. Army's 18th Airborne Corps, stationed in the U.S. mainland at Fort Bragg, North Carolina. Founded in 1917, it is currently the only airborne division in the U.S. Army, and has long been known as the sharp end of the U.S. strategic force, the fastest division in the U.S. Army in terms of strategic response time.

10, the U.S. 101st Air Assault Division: nicknamed the "Screaming Eagles"

Affiliated with the 18th Airborne Corps, the division is stationed at Fort Campbell, Kentucky, on U.S. soil. The division has rapid air mobility, powerful firepower and assault force, able to long-distance beyond the terrain obstacles, the enemy to implement a sudden strike, is the U.S. Army's only major reliance on helicopters to carry out aerial maneuvering operations of the rapid reaction force.