Division Support Command contains administrative support units and elements to maintain the uninterrupted flow of materiel supply. Combat trains are div supply installations which are located in division rear area. The combat trains are those vehicles, equipment, and personnel required for the immediate logistics support of the battalion combat mission. The combat trains are located 5 to 8 kilometers behind the unit firing positions. Battalion field trains are normally located in the brigade trains to receive support from logistics support elements of the division.