Galuade

From the Metal Gear Wiki

Galuade is the name of the fortress Metal Gear: Ghost Babel takes place, it is the base of the GLF and Black Chamber which is built in the remains of Outer Heaven. Solid Snake infiltrated the base in 2002, in an alternate timeline from the regular Metal Gear universe. A reference to the game is made in Metal Gear Solid 4: Guns of the Patriots, where the Five-seveN is mentioned as being used in Solid Snake's mission in Galuade.