This unit is one of the latest additions in the Army Transformation process for the 4th ESC, and manage a peacetime downtrace that has command and control of approximately 3,500 Army Reservists located throughout the Texas area, and its Soldiers support diverse missions that are logistical in nature.

The 300th was redesignated as the 300th Transportation Corps Service Group on 2 December 1946 and allotted to the Organized Reserves.

The 300th moved from Butler, Pennsylvania, on 18 September 2009 where it was redesignated and activated as the first Army Reserve Sustainment Command in the state of Texas.

An activation ceremony was held on 19 April 2008 in Grand Prairie at the Armed Forces Reserve Complex.

[3] This article incorporates public domain material from websites or documents of the United States Army.