The Sioux Ordnance Depot Fire and Guard Headquarters was built in 1942. The purpose of the building was to provide a center of operations for the depot security force and fire department. The building housed equipment essential for surveillance of sensitive areas within the depot perimeter. It also provided facilities for monitoring depot fire control. In an effort to conserve critical war materials the building was constructed of wood, concrete, brick, gypsum board, and cement asbestos. Metal components were used only in the building's mechanical systems and assembly fasteners. The building remains on its original site, and retains both structural and historic integrity.