G-1 Base

The G-1 Base (G-1ベース, Ji-Wan Beesu) is a Britannian land-cruiser commonly employed by the known members of the Imperial Family as a mobile command center and a field hospital. Since these mobile bases are almost always carrying someone important, they are always surrounded by motorcades of police, medical vehicles, and escorted by the regular military in the form of tanks, armored vehicles, and Knightmares.

G-1 Base also carries Knightmares inside. It can carry up to ten Knightmare frames and launch them from its two side catapults. The G-1 Base first appeared in Code Geass Season 1 ep. 1. It appears that there are multiple G-1 bases because one was destroyed near the beginning of season 2 then later on another one briefly makes an appearance but is also destroyed.