Derived from the design of the Repair facility used during the First Tiberium War, the service depot serves the same purpose: repairing GDI vehicles. In the Second Tiberium War, the newly designed Orca Carryall was utilized to carry vehicles from conflict areas to service depots for repair.
The Service Depot is a circular platform where vehicles are repaired. Repairing a unit takes far less resources than building a new unit, but still requires some resources. If a GDI Commander runs out of credits while repairs are being performed, repairs will cease until more credits are acquired. The building itself is not heavily armored, and require a larger area around it to maneuver vehicles in the line, being an open design.