Sixth United States Army

Sixth Army is a theater army of the United States Army. The Army service component command of United States Southern Command, its area of responsibility includes 31 countries and 15 areas of special sovereignty in Central and South America and the Caribbean. It is headquartered at Fort Sam Houston.

Not to be confused with Sixth United States Army Group.

Sixth Army
Active1943–1995
2008–present
Country United States of America
Branch United States Army
TypeTheater Army
RoleComponent command
Garrison/HQFort Sam Houston, Texas
Nickname(s)"Alamo Force"
Motto(s)Born of War
EngagementsWorld War II
Commanders
Notable
commanders		Walter Krueger
Joseph Stilwell
Albert C. Wedemeyer
Robert M. Cannon
David E. Grange Jr.
William Hardin Harrison
Insignia
Flag
Distinctive unit insignia
Sixth Army's Shoulder Sleeve Insignia 1927-1945
Saw limited use in WW2
Sixth Army's Shoulder Sleeve Insignia during WW2 until the 1950s
NATO Map Symbol

The Sixth Army saw extensive service in the South Pacific during World War II, including in New Britain, New Guinea, and the Philippines. Postwar it served stateside training army forces until its inactivation during force reduction in 1995. The army was reactivated in 2007.

History

The Sixth United States Army was activated in January 1943, commanded by Lieutenant General Walter Krueger.[1] Under the code name Alamo Force,[2] it assumed control of the majority of US Army units involved in Operation Cartwheel, the campaign to isolate and neutralize the Japanese base at Rabaul in New Britain. Following the completion of Cartwheel, Sixth Army joined the Australian Army and other US forces on the north coast of New Guinea.[3] Similar in conception to the island hopping operations of the central Pacific, the object of the attacks was to land, establish a garrison and airfield which could support the next strike, and then move on.

In September 1944, Sixth Army was relieved from operations in New Guinea by the Eighth United States Army. On 20 October 1944, X Corps and XXIV Corps, under Sixth Army, invaded Leyte in the Philippines. By December, Leyte was secured, and the Sixth Army was relieved again by Eighth Army to prepare for the invasion of Luzon.[4] As a prelude to that invasion, the island of Mindoro was invaded by the Western Visayan Task Force comprising the 19th and 503rd Regimental Combat Teams.[5] Sixth Army took part in the Invasion of Lingayen Gulf[6] on 9 January 1945 with the subordinate units of I and XIV Corps.[7] Sixth Army units fought south until they met up those of Eighth Army advancing from around Manila. Sixth Army then continued to clear the north of Luzon and confronted the Shimbu Group in the Sierra Madres until the end of the war. Sixth Army was to have provided the ground forces for the first phase of the invasion of Japan,[8] though after Japan's early surrender Sixth Army was reassigned to occupation duty in Japan.[9] Sixth Army returned to the United States in 1946, and was headquartered at the Presidio of San Francisco.

After the war, Sixth Army took responsibility for training of Army forces from part of the continental United States. It was eventually inactivated in June 1995 due to force reductions.[10]

Reactivation

In 2007 it was decided that US Army South would be redesignated as US Army South (Sixth Army) under the Army modularization program.[11][12] It is garrisoned at the Old Brooke Army Medical Center building at Fort Sam Houston.[13]

Organization of the army after reformation is as follows:[14]

Commanding officers

References
  1. "U.S. Army Campaigns: WWII - Asiatic-Pacific Theater". Center of Military History. United States Army. 19 November 2010. Retrieved 11 July 2011.
  2. Eustace E. Nabbie (22 September 1993). "The Alamo Scouts" (PDF). Center for the study of intelligence. Central Intelligence Agency. Archived from the original (PDF) on 13 February 2008. Retrieved 11 July 2011.
  3. Cooke, Tim; Adrian Gilbert; Tony Hall; Robert Jackson; Chris McNab; Donald Somerville; Robert Stewart; Ian Westwell (2004). History of World War II. Tarrytown, New York: Marshall Cavendish. p. 383. ISBN 978-0-7614-7482-1. Retrieved 11 June 2011.
  4. "Leyte". Center of Military History. United States Army. 3 October 2003. Archived from the original on 9 February 2016. Retrieved 11 July 2011.
  5. Smith, Robert Ross (1963). Triumph in the Philippines. Government Printing Office. p. 45. ISBN 9780160899539. LCCN 62-60000. Retrieved 11 July 2011.
  6. Video: Allied Bombers Strike On Two Fronts Etc (1945). Universal Newsreel. 1945. Retrieved 21 February 2012.
  7. "Luzon 1944 - 1945". Center of Military History. United States Army. 3 October 2003. Archived from the original on 15 December 2008. Retrieved 11 July 2011.
  8. "CHAPTER XIII: "DOWNFALL" THE PLAN FOR THE INVASION OF JAPAN". Center of Military History. United States Army. 20 June 2006. Archived from the original on 17 August 2019. Retrieved 11 July 2011.
  9. "CHAPTER II: TROOP MOVEMENTS, DISPOSITIONS, AND LOCATIONS". Center of Military History. United States Army. 11 December 2006. Archived from the original on 18 January 2012. Retrieved 11 July 2011.
  10. Carl Nolte (24 June 1995). "PAGE ONE -- Troops March From Presidio into History". San Francisco Chronicle. Retrieved 11 July 2011.
  11. Armies and Corps (PDF) (Map). United States Army. Retrieved 21 December 2008.
  12. Cavallaro, Gina (9 October 2007). "New name, same mission for U.S. Army South". Army Times. Army Times Publishing Company. Retrieved 21 December 2008.
  13. "Fort Sam Houston, Texas" (PDF). Base Realignment and Closure. United States Army. 6 March 2007. Archived from the original (PDF) on 28 September 2011. Retrieved 11 July 2011.
  14. "U.S. Army South Organization". arsouth.army.mil. Archived from the original on 21 December 2019. Retrieved 19 November 2019.
  15. "Sixth Army Commander Appointed". San Francisco Examiner. 26 June 1965. p. 9 – via Newspapers.com.
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