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| United States Army XX Corps | |
|---|---|
| Unit name | XX Corps |
| Caption | Shoulder sleeve insignia |
| Dates | 1944–1946; 1957–1968 |
| Country | United States |
| Branch | United States Army |
| Type | Corps |
| Role | Combined arms operations |
| Size | Corps |
| Command structure | United States Sixth Army, United States Eighth Army |
| Garrison | Hokkaido; Fort Bragg |
| Battles | World War II, Battle of the Bulge, Rhineland Campaign, Leyte Campaign (1944) |
| Notable commanders | Joseph Stilwell, William H. Rupertus, Ferdinand F. Huebner |
United States Army XX Corps was a corps-level formation of the United States Army activated in 1944 for operations in the Pacific and European Theaters during World War II. The corps participated in major campaigns across Leyte, Luzon, and later in Germany and Austria, before undergoing postwar reassignments and eventual inactivation amid Cold War reorganizations. XX Corps' lineage reflects shifts in American strategic priorities between the Pacific campaign and occupation duties in Japan and Germany.
XX Corps was constituted during the later stages of World War II as Allied planners reorganized field armies to exploit breakthroughs in both the European Theater of Operations and the Pacific War. The corps drew on personnel experienced in Operation Market Garden, Operation Overlord, and island campaigns such as Guadalcanal and Iwo Jima, integrating veterans from Eighth Army (United States), Sixth Army (United States), and corps-level headquarters formerly attached to First United States Army. Command decisions were influenced by theater commanders including Douglas MacArthur, George S. Patton, and staff from War Department planning sections. After combat operations, XX Corps participated in occupation duties, working alongside units under United States Army Forces, Pacific and United States Army Europe. Its administrative history intersected with reorganizations following the National Security Act of 1947 and later the Pentomic reorganization of the 1950s.
As a corps headquarters, XX Corps usually commanded a mix of infantry, armored, artillery, engineer, and support formations drawn from divisions such as the 1st Cavalry Division (United States), 24th Infantry Division, 33rd Infantry Division (United States), and armored divisions like the 3rd Armored Division (United States). Corps-level assets included corps artillery brigades, engineer battalions, signal companies, medical units, and military police detachments. The headquarters staff comprised sections mirroring G-1 through G-4 functions, as coordinated with theater commands such as United States Army Forces Pacific and allied headquarters like Southwest Pacific Area. Logistics were coordinated through ports such as Leyte Gulf and Manila Bay, with supply lines tying into Admiral Chester W. Nimitz's naval logistics planning and General Douglas MacArthur's basing strategies.
XX Corps first saw major action in the Philippines Campaign (1944–45), conducting combined-arms operations during the Battle of Leyte and the Battle of Luzon, where corps formations assaulted fortified positions held by Imperial Japanese Army units. During amphibious operations the corps coordinated with United States Marine Corps, United States Navy, and Allied Expeditionary Force naval elements, employing close air support coordinated with USAAF in the Pacific air forces. In the European context, XX Corps elements were involved in the Rhineland Campaign and actions related to the Battle of the Bulge logistics and reinforcement flows, linking with formations such as 12th Army Group and the 21st Army Group. The corps' engineers cleared obstacles left from the Siege of Manila and northern Luzon defenses while artillery units provided counter-battery fire in support of infantry divisions prosecuted under commanders like Walter Krueger and Omar Bradley. XX Corps participated in river crossings on the Hudson of Luzon and coordinated prisoner evacuation and civil affairs with occupation authorities such as the Supreme Commander for the Allied Powers in the Pacific.
Following Japan's surrender after Operation Downfall was canceled and the Surrender of Japan, XX Corps transitioned to occupation duties in Japan and later elements redeployed to Germany to assist in stabilization, demobilization, and repatriation. During the early Cold War the corps was subject to force reductions tied to the Armed Forces Readjustment Act and shifting priorities amid the Korean War and NATO commitments. XX Corps headquarters was reactivated briefly during the 1950s under continental defense plans before final inactivation during the 1960s as the Pentomic and later Reorganization Objective Army Divisions reforms reshaped corps-level commands. Remaining lineage and honors were perpetuated by successor formations within United States Army Forces Command and component elements assigned to United States Army Europe.
Notable commanders included senior officers transferred from other theaters: Joseph Stilwell provided theater-level advisory experience; William H. Rupertus oversaw amphibious coordination with United States Marine Corps units; and Ferdinand F. Huebner directed occupation administration and posthostilities planning. Other corps commanders who influenced doctrine and tactics were drawn from leaders who had served under George C. Marshall, Douglas MacArthur, and Dwight D. Eisenhower, linking XX Corps' command lineage to broader Army leadership trends.
XX Corps and its subordinate formations received campaign streamers for Leyte Campaign (1944), Luzon, the Rhineland Campaign, and credits associated with service in Germany and Japan. Individual subordinate units earned decorations including the Distinguished Unit Citation (United States), Silver Star (United States), and Bronze Star Medal awards conferred during specific operations such as Battle of Leyte Gulf engagements and urban combat in Manila. Corps-level citations noted coordination with allied units including the Australian Army, British Army, and Philippine Commonwealth Army during multinational operations.
Category:Corps of the United States Army Category:United States Army in World War II Category:Military units and formations established in 1944