On August 19,1974, under the auspices of Project CHASE (the consolidation of U.S.Army Europe Headquarters and Area Support Elements) the 1st Support Brigade was reorganized, upgraded to a general officer command and moved its headquarters from Mannheim to Panzer Kaserne, Kaiserslautern, Germany. Consequently, the reorganization of the 1st Support Brigade provided for a dual function headquarters: Combat Service Support and Area Support.
In 1976, the 1st Support Brigade's personnel strength was increased to 16,000, thereby constituting the largest brigade in the U.S. Army. Consequently, the Army approved the elevation of the commander's position to a Major General, and, on August 19, 1976, the brigade was redesignated the 21st Support Command. On October 18, 1988, the 21st Support Command was officially redesignated as the 21st Theater Army Area Command.
Consequently, the commander's position was elevated to that of a Lieutenant General. In 1993, following the collapse of the Soviet Union, the 21st Theater Army Area Command was predesignated as the 21st Theater Support Command, and the commander's position was returned to that of a Major General. On August 28, 2006, Headquarters and Headquarters Company, 21st Theater Support Command, and Headquarters and Headquarters Company, 200th Theater Distribution Brigade, were consolidated and redesignated as Headquarters and Headquarters Company, 21st Theater Support Command.
Further, HHC, 21st TSC, was assigned to the cognizance of the newly constituted Troop Support Battalion, 21st Theater Support Command. On July 16, 2007, the 21st Theater Support Command was reorganized and redesignated as the 21st Theater Sustainment Command. Concurrently, the Troop Support Battalion, including the subordinate HHC, 21st TSC, was reorganized and redesignated as the Special Troops Battalion, 21st Theater Sustainment Command, Panzer Kaserne, Kaiserslautern, Germany. Campaign Participation Credits include: Operations Enduring Freedom, Iraqi Freedom Avid Recovery. Decorations include: Army Unit Superior Award (2001-2002)