The service depot is an octagonal platform where vehicles are repaired. There is a small fee to the commander for the repair process. The depot also reloaded anti-tank and anti-personnel minelayers. It also provided necessary parts needed to build MCVs. Its open design which allowed vehicles to drive on and off of it allowing it to quickly repair vehicle after vehicle without delay. Units with a gun turret may engage nearby enemies while being repaired.
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The Service Depot repairs any damaged vehicle that you move onto it. Mine Layer units can be re-loaded by driving them onto the pad. (Repairing a vehicle is much faster than building one, and costs a fraction of the original price. This is a worthy investment.) - Red Alert manual(src)
Allied Second World War Arsenal 
Soviet Second World War Arsenal 
