The Service Depot is a building. A vehicle or an aircraft can enter the service depot and repair itself for a small fee. Loosely speaking, the Radar Dome is a requirement for "range or technology oriented" units, whilst the Service Depot is a requirement for "Heavy or mechanically oriented" units. The service depot is a requirement for the following infantry: * Hijacker (Soviets), Mechanic (Allies) The service depot is a requirement for the following vehicles: * MCV * Mine Layer * Heavy Tank (Soviets), and Medium Tank (Allies) * Mammoth Tank * MAD Tank