The Eighth Army took part in many of the amphibious landings in the Southwest Pacific Theater of World War II, eventually participating in no less than sixty of them.

[7] Occupation forces landed on 30 August 1945, with its headquarters in Yokohama, then the HQ moved to the Dai-Ichi building in Tokyo.

[8] Four quiet years then followed, during which the Eighth Army gradually transitioned from a combat-ready fighting force into a constabulary.

[9] Lieutenant General Walton H. Walker took command in September 1948, and he tried to re-invigorate the Army's training, with mixed success.

However, the stage was eventually reached as enough units of Eighth Army arrived in Korea to make a firm front.

However, once U.S. units neared the Yalu River and the frontier between North Korea and China, the Chinese intervened and drastically changed the character of the war.

Eighth Army was decisively defeated at the Battle of the Chongchon River and forced to retreat all the way back to South Korea.

The overstretched Eighth Army suffered heavily with the Chinese offensive, who were able to benefit from shorter lines of communication and with rather casually deployed enemy forces.

The Chinese broke through the U.S. defenses despite U.S. air supremacy and the Eighth Army and U.N. forces retreated hastily to avoid encirclement.

Eighth Army's morale and esprit de corps hit rock bottom, to where it was widely regarded as a broken, defeated rabble.

Then, in 1971, the 7th Infantry Division was withdrawn, along with the command units of I Corps, which were moved across the Pacific Ocean to Fort Lewis, Washington.

Besides forming a trip-wire against another North Korean invasion, the 2nd Infantry Division remained there as the only Army unit in South Korea armed with tactical nuclear weapons.

At the end of the Cold War Eighth Army consisted of the following units: In 2003, plans were announced to move the 2nd Infantry Division southward.

[2] In April 2017 the Eighth Army headquarters began its move from Yongsan to Camp Humphreys and held a ceremony to relocate a statue of General Walton Walker.

Continuing is role as a combat service support unit, it is capable of being expanded and mobilized during a wartime situation.