300th Sustainment Brigade (United States)

The 300th Sustainment Brigade is a Major Subordinate Command (MSC) of the 4th Expeditionary Sustainment Command (4th ESC) and one of only eight of its kind in the Army Reserve. 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.^[1]

The brigade is a subordinate unit of the 4th Expeditionary Sustainment Command. As of December 2025 the brigade consists of the following units:^[2]

• 300th Sustainment Brigade, in Grand Prairie (TX)
  • Headquarters and Headquarters Company, in Grand Prairie (TX)
  • 363rd Quartermaster Battalion (Petroleum Pipeline and Terminal Operation), in San Marcos (TX)
    • Headquarters and Headquarters Detachment, in San Marcos (TX)
    • 141st Quartermaster Company (Petroleum Pipeline and Terminal Operation), in Tyler (TX)
    • 223rd Transportation Company (Support Maintenance), in Grand Prairie (TX)
    • 320th Quartermaster Team (Petroleum Liaison), in Fort Worth (TX)
    • 340th Quartermaster Company (Field Services) (MOD), at Joint Base San Antonio (TX)
    • 645th Quartermaster Detachment (Petroleum Line), in San Marcos (TX)
  • 15th Quartermaster Team (Petroleum) (Quality Analysis), in Denton (TX)
  • 328th Adjutant General Personnel Company (Human Resources), at Joint Base San Antonio (TX)
  • 350th Adjutant General Personnel Company (Human Resources), in Grand Prairie (TX)
  • 411th Quartermaster Company (Petroleum Support), in Grand Prairie (TX)
  • 513th Quartermaster Detachment (Support) (Theatre Distribution Augmentation Element), at Fort Hood (TX)
  • 957th Quartermaster Company (Petroleum Support), in Denton (TX)

The 300th Sustainment Brigade mission is to plan, coordinate, synchronize, monitor, and control Logistics Operations within an assigned area of responsibility. The Brigade also coordinates Host Nation Support (HNS) and contracting, as well as providing support to joint, interagency, and multinational forces as directed.^[1]

The 300th Sustainment Brigade's history began on 26 June 1945 as the 300th Transportation Group. The unit activated on 29 June 1945 in France, and was inactivated in France on 22 November 1945. The 300th was redesignated as the 300th Transportation Corps Service Group on 2 December 1946 and allotted to the Organized Reserves. On 12 December 1946 the unit was activated in Baltimore, Maryland. During that timeframe, the Organized Reserves became the Army Reserve on 9 July 1952. The unit inactivated on 29 August, and during inactivation was redesignated as the 300th Transportation Group on 3 April 1959. The unit changed locations several more times to include Fort George Meade, Maryland, on 1 November 1960; Andrew Air Force Base, Maryland, on 20 May 1964; and Butler, Pennsylvania, on 31 January 1968. 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. The 300th was activated for mobilization to Kuwait and supporting areas in October 2018 in support of Operation Spartan Shield and Operation Inherent Resolve to provide logistical support for the warfighters. The 300th has since completed their rotation in July 2019 respectively. ^[3]

• The Institute of Heraldry: 300th Sustainment Brigade

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