The 311 Sustainment Command is a unit within the United States Army responsible for logistics and support services. Established as the 311th Supply and Transportation Battalion during World War II, it has evolved over time to encompass a wide range of functions including maintenance, supply, transportation, and other sustainment operations. The command is headquartered at Fort Leonard Wood, Missouri, and its primary mission is to support combat units by providing the necessary resources they require for effective operation. The 311 Sustainment Command operates under the United States Army Materiel Command, which oversees all logistics-related activities within the army.