109th Engineer Battalion

Forward Support Company, 109th Eng. Bn.

842nd Engineer Company

155th Engineer Company

216th & 451st Engineer Detachments (Firefighting Teams)

​The 109th Engineer Battalion, of Rapid City, provides mission command and supervision for five units with nearly 400 Soldiers in 5 communities throughout South Dakota. With about 70 assigned members to the Headquarters and Headquarters Company, the 109th assists assigned units in meeting training, administrative and logistical requirements. The 109th also provides mission command for attached or assigned engineer units as a part of its federal mission. The battalion headquarters can coordinate and execute tactical operations involving mobility, counter mobility and survivability tasks on the battlefield.