A Dymaxion Deployment Unit (DDU) is a structure designed in 1940 by Buckminster Fuller consisting of a 20-foot circular hut constructed of corrugated steel looking much like a yurt or the top of a metal silo. The interior was insulated, finished with wallboard, port holes and a door. The dome-like ceiling has a hole in the top and a cap for ventilation. At Fort Monmouth, New Jersey, two DDU reside prominently on the roof top of the Myer Center.