21st Theater Sustainment Command The 21st Theater Sustainment Command ( 21st TSC ) provides theater sustainment throughout EUCOM and AFRICOM Areas of Responsibility in support of USAREUR and 7th Army . On order , deploys to support theater opening , distribution , and Reception , Staging , Onward Movement & enable Integration ( RSO & I ) functions . Be prepared to support Joint and Coalition forces . History . The heritage of 21st Theater Sustainment Command began on 23 June 1965 with the activation of the 1st Support Brigade . The 21st TSC originated as a maintenance support headquarters under Seventh Army Support Command , the brigade ' s first home was Taylor Barracks , Mannheim , Germany . After the United States military withdrawal from France in 1967 and the organization of the U . S . Theater Army Support Command , Europe , informally known as TASCOM , the brigade became the rear - area counterpart of the newly formed corps support commands . Assigned to TASCOM in 1969 , 1st Support Brigade was responsible for Prepositioning of Materiel Configured to Unit Sets ( POMCUS ) and provided combat service support for U . S . units in the area west of the Rhein River . In 1974 , TASCOM was merged with Headquarters , United States Army , Europe , and the missions of 1st Support Brigade were expanded to include base operations support for eight military communities as well as the management of regional area support . The brigade was upgraded to a general officer command and the headquarters moved to Panzer Kaserne , Kaiserslautern , Germany . By mid - 1976 the 1st Support Brigade ' s personnel strength was approximately 16 , 000 – the largest brigade in the U . S . Army . Consequently , the Department of the Army approved the elevation of the commander ' s position to major general and on 19 August 1976 the brigade was re - designated 21st Support Command . During the next several years , important missions and units were assigned to the 21st and , in June 1981 , the President of the United States elevated the commander ' s position to lieutenant general , reflecting the organization ' s status as a Theater Army Area Command . Accordingly , on 18 October 1988 , 21st Support Command was officially re - designated the 21st Theater Army Area Command . After the dissolution of the Union of Soviet Socialist Republics , U . S . forces in Europe began a reduction in personnel to accompany the reduced threat . Authorizations for both military and civilian positions were decreased substantially and , in 1993 , the grade of the 21st TAACOM commander was returned to major general . On 18 October 2000 the 21st TAACOM structure was replaced by the Army and U . S . Army Europe and transformed into the 21st Theater Sustainment Command ( TSC ) . In 2006 , the 21st TSC HQ further changed by absorbing some functions of some of its former units , such as the 200th MMC ( Material Management ) and 1st TMCA ( Transportation Movement Control ) because these units deactivated . This restructuring was needed to meet the needs of the Army and the nation in the 21st century , by becoming a deploy able force . This change made the 21st the Army ' s largest forward deployed unit and a major forward presence , in theater logistics organization in support of Central Region , Europe . Throughout this evolution the 21st has retained the lineage and honors , distinguishing flag ( colors ) , and distinctive unit badge and shoulder sleeve insignia of the " FIRST IN SUPPORT ! " Units and Command Group c . 2012 . Command Group . = External Links =