IX Corps (United States)

IX Corps
Shoulder sleeve insignia of IX Corps
Active	1940–94
Country	United States
Branch	United States Army
Motto(s)	Pride of the Pacific
Engagements	World War II Korean War
Commanders
Notable commanders	Charles W. Ryder (1944–48) Leland Hobbs (1949–50) Frank W. Milburn (1950) John B. Coulter (1950–51) Bryant Moore (1951) Oliver P. Smith (1951) William M. Hoge(1951) Willard G. Wyman (1951–52) Joseph P. Cleland (1952) Reuben E. Jenkins (1952–53) Samuel T. Williams (1954) Carter B. Magruder (1954–55) James E. Moore (1955–58) John R. Guthrie (1975–77)
Insignia
Distinctive unit insignia

IX Corps was a corps of the United States Army. For most of its operational history, IX Corps was headquartered in or around Japan and subordinate to US Army commands in the Far East.

Created following World War I, the corps was not activated for use until just before World War II almost 20 years later. The corps spent most of World War II in charge of defenses on the West Coast of the United States, before moving to Hawaii and Leyte to plan and organize operations for US forces advancing across the Pacific. Following the end of the war, IX Corps participated in the occupation of mainland Japan.

The corps' only combat came in the Korean War. It is best known for its exploits as a senior command of the Eighth United States Army, commanding front line UN forces in numerous offensives and counteroffensives throughout the war. The corps served on the front lines for most of the conflict and took command of several combat divisions at a time. Following the end of the Korean War, IX Corps remained in Korea for several years until it was moved to Japan. The corps spent almost 40 years as an administrative command of the US Army forces there, overseeing administrative functions but no combat. It was finally inactivated and consolidated in 1994.

IX Corps was formed from November 25 to 29, 1918 in Ligny-en-Barrois, France. It was demobilized in France on May 5, 1919. IX Corps was subordinate to Second United States Army, and after moving its headquarters to Saint-Mihiel, and commanded forces along the armistice line between Jonville-en-Woëvre and Fresnes-en-Woëvre until its deactivation.Adelbert Cronkhite was the first corps commander, and William K. Naylor the first chief of staff.

The IX Corps headquarters was first constituted on 29 July 1921 in the organized reserves, a new corps formation intended to compliment the existing corps commands in the active duty component of the force by providing command to reserve units. It was assigned a shoulder sleeve insignia shortly thereafter. Though the corps was not activated, it remained on the organizational rolls of the Army, to be called on when needed. On 1 October 1933, the corps was moved to the active duty roster, though it remained deactivated.