The foundation of any base starts with the Mobile Construction Vehicle. Able to deploy itself into a fully functioning Construction Yard, the MCV is a highly prized piece of equipment for both GDI and Nod.
Game unit
The MCV is heavily armored, but also extremely slow, though this can be mitigated somewhat through the use of Orca Carryall in GDI's case. Since it is completely unarmed and very expensive, it must be escorted by other forces while en route to unpack location.