Tenth United States Army

Tenth United States Army
Unit name	Tenth United States Army
Caption	Emblem
Country	United States
Branch	United States Army
Type	Field army
Garrison	Okinawa
Notable commanders	Joseph Stilwell, Simon Bolivar Buckner Jr., Joseph W. Stilwell

Tenth United States Army

The Tenth United States Army was a major United States Army formation activated during World War II that served in the Pacific War and on Okinawa. Formed to direct large-scale operations, it integrated formations drawn from the United States Army Ground Forces, United States Marine Corps, United States Army Air Forces, and Allied units under commanders including Joseph Stilwell and Simon Bolivar Buckner Jr.. The army played a central role in the final American offensives against the Empire of Japan, conducting amphibious assaults, combined-arms operations, and joint operations with naval and air forces.

History

The Tenth United States Army was constituted amid an expansion of United States Army formations after the Attack on Pearl Harbor and the entry of the United States into World War II. Initial planning drew on lessons from the Guadalcanal Campaign, the Gilbert and Marshall Islands campaign, and the Marianas Campaign, reflecting doctrines developed by leaders such as Douglas MacArthur and Chester W. Nimitz. Activated to prepare for major amphibious operations in the Ryukyu Islands, the army’s establishment intersected with strategic guidance from the Joint Chiefs of Staff and theater directives from Admiral William Halsey Jr. and Admiral Chester Nimitz. Its formation involved coordination with the United States Pacific Fleet, the Southwest Pacific Area, and the South Pacific Area command structures.

Organization and Command Structure

The Tenth United States Army’s command structure combined army headquarters staff functions with attached corps and divisions from the United States Army, the United States Marine Corps, and allied contingents. It included staff branches overseeing operations, intelligence, logistics, and personnel influenced by doctrine from the War Department and training standards promulgated by Lieutenant General Lesley J. McNair and the Army Service Forces. Corps and divisional elements reported through corps commanders who coordinated with naval task forces led by admirals such as Raymond A. Spruance and William F. Halsey Jr.. Commanders of the Tenth United States Army exercised operational control over formations including the 7th Infantry Division (United States), the 77th Infantry Division (United States), the 96th Infantry Division (United States), the 1st Marine Division (United States), and the 6th Marine Division (United States), alongside support from units like the 82nd Airborne Division (United States) in earlier Pacific operations and attached engineer and artillery groups. Senior leadership transitions from Joseph Stilwell to Simon Bolivar Buckner Jr. and then to Joseph W. Stilwell influenced command relationships and liaison with the United States Marine Corps and the United States Navy.

World War II Operations

Operating in the final year of World War II, the Tenth United States Army directed preparation for and execution of the Battle of Okinawa (Operation Iceberg), coordinating amphibious doctrine developed after the Tarawa landing and the Saipan operations. Air support was integrated from the United States Army Air Forces and carrier aviation from the United States Navy under joint planning influenced by campaigns such as Leyte Gulf and Iwo Jima (Battle of Iwo Jima). The army planned logistics using bases in the Marianas Islands, staging areas in the Philippines following the Leyte campaign, and naval support from the Seventh Fleet (United States) and Fifth Fleet (United States). Intelligence and counterintelligence efforts drew on lessons from Codebreaking efforts exemplified by Station HYPO and coordination with signals units involved since the Battle of Midway.

Notable Campaigns and Battles

The Tenth United States Army’s most notable engagement was the Battle of Okinawa, where it faced entrenched defenses organized by the Imperial Japanese Army and coordinated kamikaze attacks launched against United States Navy carriers and transports. Operations included large-scale amphibious landings influenced by tactics from Operation Forager and combined-arms assaults reflecting experiences from Battle of Kwajalein and Battle of Tarawa. During Okinawa, the army fought against formations connected to commanders such as Lieutenant General Mitsuru Ushijima and Isamu Cho while naval engagements involved admirals like Kiyohide Shima and kamikaze operations associated with the Taiho and Shokaku era carriers’ experiences. The campaign intersected with strategic events including the Potsdam Declaration and preceded the Surrender of Japan.

Postwar Activity and Inactivation

After Japan’s surrender, the Tenth United States Army oversaw demobilization tasks, occupation preparations, and redeployment of forces to staging areas including Leyte and Guam. It coordinated with occupation planners associated with Douglas MacArthur in the Occupation of Japan and with logistics organizations like the Army Service Forces and the Transportation Corps. Shifts in force structure following the National Security Act of 1947 and reorganization of United States Armed Forces led to reassignment of units and eventual inactivation of the army as part of postwar drawdown and restructuring influenced by studies from the Hoover Commission and policy changes under presidents such as Harry S. Truman.

Legacy and Honors

The Tenth United States Army’s legacy endures in histories of the Pacific War, analyses by military historians like Samuel Eliot Morison and John Keegan, and commemorations at sites such as the Okinawa Prefecture memorials and the National WWII Museum (New Orleans). Unit citations and campaign streamers recognize participation in operations including Okinawa and broader Pacific Theater campaigns; veterans received awards like the Distinguished Service Cross (United States), the Navy Cross, and campaign medals administered by the Department of Defense. Postwar scholarship in journals represented by the Journal of Military History and works in the United States Army Center of Military History continue to evaluate the Tenth United States Army’s operational art, amphibious doctrine contributions, and its impact on postwar American force design.

Category:United States field armies Category:Military units and formations established in 1944 Category:Military units and formations disestablished in 1946