The London-class mobile shield generator is a popular support vehicle used by the Federation.
These mobile shield generators are capable of producing a protective shield around a battalion or colonial structures and thus provide added protection. However, the energy requirements result in this vehicle suffering from a poor engine system and a reduction in the power of the sensors as the energy is devoted to the shield emitter. This makes them slow as well as cumbersome vehicles. This makes them a rare sighting if alone on the battlefield as they are always part of a larger convoy. (TOS video game: New Worlds)