U.S. Sixth Army

U.S. Sixth Army was a field army of the United States Army primarily active during World War II and the Cold War. It was established in Texas in 1943 and became a key command in the Pacific War, conducting major operations under General Douglas MacArthur's South West Pacific Area command. Following the war, it served as a component of the Continental Army Command and later Forces Command, responsible for training and readiness, until its inactivation in 1995.

History

The activation of the new command was ordered by the War Department at the Camp San Luis Obispo in January 1943, initially designated as Alamo Force to function as the operational component for General Douglas MacArthur's headquarters. Under the leadership of Walter Krueger, it moved its headquarters to Brisbane and began planning for the New Guinea campaign. Throughout the war, it remained a separate entity from the SWPA administrative structure, allowing for streamlined command during complex amphibious operations. Following the Surrender of Japan, it was assigned to the Japanese occupation and established its headquarters at the Kyoto Hotel, overseeing western Honshu and the entire island of Shikoku.

Organization

As a field army, its structure evolved to meet the demands of the Pacific Theater, typically comprising multiple corps and independent divisions. During the Philippines campaign, it controlled the I Corps, X Corps, and XIV Corps, alongside numerous support units from the United States Army Air Forces and United States Navy. Post-war, its composition shifted to include various Army Reserve and Army National Guard units under its jurisdiction as part of the Continental Army Command. Its final headquarters at Fort Sam Houston in San Antonio coordinated training for a wide array of brigades and divisions across the western United States.

Commanders

The first and most prominent commander was General Walter Krueger, who led it from its formation through all its major combat operations, including the Battle of Luzon and the Battle of Leyte. He was succeeded by General Joseph Stilwell in September 1945, who oversaw the initial occupation duties in Japan. Later notable commanders included General Mark W. Clark during the early Cold War and General John H. Michaelis, who later served as Commander-in-Chief of the United Nations Command in Korea. Its final commander was Lieutenant General William H. Harrison Jr., who presided over its inactivation ceremony.

Operations and campaigns

Its first major combat operation was the successful Battle of Hollandia in April 1944, a daring amphibious envelopment that bypassed strong Imperial Japanese Army positions. This was followed by the pivotal Battle of Leyte, which initiated the liberation of the Philippines and involved fierce fighting around the Leyte Gulf. The subsequent Battle of Luzon was its largest campaign, involving the seizure of Manila and operations in the Cagayan Valley. After the Battle of Okinawa, it prepared for the anticipated invasion of the Japanese home islands, a mission rendered unnecessary by the Atomic bombings of Hiroshima and Nagasaki.

Legacy and honors

The unit received several campaign streamers for its service in World War II, including for the New Guinea, Bismarck Archipelago, and Philippines campaigns. Its shoulder sleeve insignia, featuring the Alamo, honored its origins in Texas and its initial "Alamo Force" designation. The lineage and honors of the organization are maintained by the United States Army North, which was activated as its successor command. Its history is commemorated at the Fort Sam Houston Museum and within the holdings of the United States Army Center of Military History.

Category:Field armies of the United States Category:Military units and formations established in 1943